CN115152294A

CN115152294A - Techniques for simplifying channel state information feedback

Info

Publication number: CN115152294A
Application number: CN202080096348.9A
Authority: CN
Inventors: 李乔羽; 魏超; 徐慧琳; 郝辰曦; 戴晶; 郑瑞明; 徐浩; 雷静; P·P·L·洪
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2022-10-04
Also published as: EP4104584A4; EP4104584A1; WO2021159445A1; US20230057169A1

Abstract

Methods, systems, and devices for wireless communication are described. A User Equipment (UE) may send a capability report to a base station indicating a trigger offset. The base station may configure the UE with one or more Channel State Information (CSI) measurement resource configurations and transmit Downlink Control Information (DCI) that triggers aperiodic CSI reporting for at least some of the CSI measurement resources. The UE may report CSI by measuring the CSI resource after the trigger offset. In some cases, CSI reports relating to different codebook types (e.g., type I, type II) may be modified, where after identifying the codebook type and determining which type of codebook to process (e.g., based on the number of CSI processing units), the UE may identify priorities associated with the different CSI reports. The UE may be configured with various parameters that relax or modify the processing of type II CSI reports.

Description

Techniques for simplifying channel state information feedback

Technical Field

The following generally relates to wireless communications, and more particularly, to techniques for simplifying channel state information feedback.

Background

Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems are capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-advanced (LTE-a) systems, or LTE-APro systems, and fifth generation (5G) systems that may be referred to as New Radio (NR) systems. These systems may employ techniques such as: code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices, which may otherwise be referred to as User Equipment (UE).

In some wireless communication systems, the base station may configure the UE for aperiodic Channel State Information (CSI) reporting. However, in some examples, aperiodic CSI reporting may result in relatively high UE processing complexity (e.g., due to signal buffering at the UE). In other examples, one type of CSI codebook used for CSI reporting may place relatively high requirements on the UE. In either case, the complex CSI reporting process may result in delays, inefficient communication, and increased power consumption.

Disclosure of Invention

The described technology relates to improved methods, systems, devices, and apparatus that support techniques for simplifying Channel State Information (CSI) feedback. In general, the described techniques enable a network, such as a base station, to configure a User Equipment (UE) with relaxed buffering for aperiodic CSI reporting. For example, the UE may send a capability report to the base station indicating a time delay (e.g., trigger offset). The base station may configure the UE with one or more CSI measurement resources and transmit Downlink Control Information (DCI) to the UE, the DCI triggering CSI reporting for at least some of the configured CSI measurement resources. The UE may generate a CSI report based on the CSI measurement resource and the trigger offset, where the UE may not expect to receive the CSI measurement resource before the trigger offset ends. The trigger offset may allow time for the UE to decode the received DCI, thereby reducing the amount of signal buffering performed by the UE.

In some cases, DCI may trigger CSI reporting associated with different codebook types (e.g., type I, type II codebooks). CSI reports relating to different codebook types may be modified to reduce the computational burden on the UE. For example, the UE may utilize priorities associated with different CSI codebook types, where the UE may identify the codebook type to be processed before identifying the priorities. In some cases, when the UE is triggered to report CSI associated with a type-II codebook and CSI related to a type-I codebook, the UE may identify multiple CSI Processing Units (CPUs) for updating the type-I and type-II codebooks and may process the CSI based on the identified CPUs for each type of codebook, which may be further based on the identified priorities. In other examples, the UE may be configured with various parameters (e.g., CSI processing time, maximum rank) that relax or modify the processing of type II CSI reports, and the UE may process the type II CSI reports differently than the type I CSI based on these parameters. Here, the various parameters may enable the UE to more efficiently generate CSI reports for codebooks associated with relatively higher complexity (e.g., as compared to other CSI reports associated with other codebooks).

A method for wireless communication at a UE is described. The method can comprise the following steps: sending a capability report to a base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources, the DCI based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending a CSI report to the base station, the CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: sending a capability report to a base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI triggering a CSI report for a first aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources, the DCI based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending a CSI report to the base station, the CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for: transmitting a capability report to a base station indicating aperiodic CSI measurement resource trigger offset supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources, the DCI based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending a CSI report to the base station, the CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: sending a capability report to a base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI triggering a CSI report for a first aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources, the DCI based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending a CSI report to the base station, the CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the capability report may include operations, features, units, or instructions for: sending the capability report indicating the aperiodic CSI measurement resource trigger offset, which may be a threshold duration after which the UE is able to receive the one or more aperiodic CSI measurement resources relative to receiving the DCI.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the capability report may include operations, features, units, or instructions for: sending the capability report indicating the aperiodic CSI measurement resource trigger offset indicating a processing time supported by the UE for decoding the DCI. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the aperiodic CSI measurement resource trigger offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the capability report may include operations, features, units, or instructions for: transmitting the capability report indicating a threshold number of aperiodic CSI measurement resources associated with the CSI report that the UE can measure, wherein the CSI report includes measurements for at least one of the one or more aperiodic CSI measurement resources up to the threshold number of aperiodic CSI measurement resources.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the threshold number of aperiodic CSI measurement resources indicates a maximum number of aperiodic CSI measurement resources associated with the CSI report that the UE is capable of measuring.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: transmitting the capability report including an indication of a buffer memory size, wherein the configuration of the one or more aperiodic CSI measurement resources may be based on the buffer memory size. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the CSI report comprises an aperiodic CSI report.

A method of wireless communication at a UE is described. The method may include: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating one of the first CSI report or the second CSI report using a set of one or more CPUs based on the first type of codebook and the second type of codebook, wherein, the first CSI report is processed based on the first type of codebook using each CPU of the set of one or more CPUs, or wherein the second CSI report is processed based on the second type of codebook using a subset of CPUs of the set of one or more CPUs, or a combination thereof; and transmitting the generated CSI report.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating one of the first CSI report or the second CSI report using a set of one or more CPUs based on the first type of codebook and the second type of codebook, wherein the first CSI report is processed using each CPU of the set of one or more CPUs based on the first type of codebook, or wherein the second CSI report is processed using a subset of CPUs of the set of one or more CPUs based on the second type of codebook, or a combination thereof; and transmitting the generated CSI report.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating one of the first CSI report or the second CSI report using a set of one or more CPUs based on the first type of codebook and the second type of codebook, wherein the first CSI report is processed using each CPU of the set of one or more CPUs based on the first type of codebook, or wherein the second CSI report is processed using a subset of CPUs of the set of one or more CPUs based on the second type of codebook, or a combination thereof; and transmitting the generated CSI report.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating one of the first CSI report or the second CSI report using a set of one or more CPUs based on the first type of codebook and the second type of codebook, wherein the first CSI report is processed using each CPU of the set of one or more CPUs based on the first type of codebook, or wherein the second CSI report is processed using a subset of CPUs of the set of one or more CPUs based on the second type of codebook, or a combination thereof; and transmitting the generated CSI report.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: identifying that the first CSI report may have a higher priority than the second CSI report; and refrain from updating the second CSI report based on generating the first CSI report using each CPU of the set of one or more CPUs. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the generated CSI report comprises sending the first CSI report.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: identifying that the second CSI report may have a higher priority than the first CSI report; and refrain from updating the first CSI report based on generating the second CSI report using the subset of CPUs of the set of one or more CPUs. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the generated CSI report comprises transmitting the second CSI report. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first type of codebook comprises a type II CSI codebook.

A method of wireless communication at a UE is described. The method may include: receiving DCI triggering a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receiving DCI triggering a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving DCI triggering a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receiving DCI triggering a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, generating the first CSI report may include operations, features, units, or instructions for: identifying, from the first set of parameters, a first set of CSI computation times associated with the first CSI report that is different from a second set of CSI computation times associated with the second CSI report. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: transmitting the first CSI report based on the first set of CSI computation times.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, generating the second CSI report may include operations, features, units, or instructions for: identifying, from the second set of parameters, the second set of CSI computation times associated with the second CSI report that is different from the first set of CSI computation times associated with the first CSI report. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: transmitting the second CSI report based on the second CSI computation time set.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, generating the first CSI report may include operations, features, means, or instructions for: identifying a rank threshold value associated with the first CSI report based on the first set of parameters. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: transmitting the first CSI report excluding a Rank Indicator (RI) based on the rank threshold value.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: identifying a first set of one or more aperiodic CSI measurement resources configured for aperiodic CSI reporting based on the first set of parameters. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: transmitting the first CSI report, which may be generated based on measurements of the one or more aperiodic CSI measurement resources.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending a capability report, the capability report comprising: a first capability indication of a UE capability to concurrently generate the first CSI report and the second CSI report, a second capability indication to separately generate the first CSI report, a third capability indication to separately generate the second CSI report, or a combination thereof.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first CSI report comprises a wideband CSI report. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving, from a base station, an indication of the first set of parameters and the second set of parameters.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first type of codebook comprises a type II CSI codebook. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, at least a portion of the first set of parameters may be different from the second set of parameters.

A method of wireless communication at a base station is described. The method may include: receiving, from a UE, a capability report comprising an indication of CSI reporting capabilities supported by the UE; identifying a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report; sending a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of the aperiodic CSI measurement resources or the UE memory size, or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI report for an aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receiving, from a UE, a capability report comprising an indication of CSI reporting capabilities supported by the UE; identifying a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report; sending a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of the aperiodic CSI measurement resources or the UE memory size, or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI report for an aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources.

Another apparatus for wireless communication at a base station is described. The apparatus may comprise means for a unit for performing the following operations: receiving, from a UE, a capability report comprising an indication of CSI reporting capabilities supported by the UE; identifying a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report; sending a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of the aperiodic CSI measurement resources or the UE memory size, or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI report for an aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources.

A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: receiving, from a UE, a capability report comprising an indication of CSI reporting capabilities supported by the UE; identifying a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering the aperiodic CSI measurement resources, or a combination thereof based on the received capability report; sending a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of the aperiodic CSI measurement resources or the UE memory size, or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI report for an aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the received capability report includes an indication of the UE memory size, wherein the UE memory size indicates one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic CSI measurement resources.

A method of wireless communication at a base station is described. The method may include: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; transmitting DCI to a UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; transmitting DCI to a UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

Another apparatus for wireless communication at a base station is described. The apparatus may include means for: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; transmitting DCI to a UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; transmitting DCI to a UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring a first set of CSI computation times associated with the first CSI report that is different from a second set of CSI computation times associated with the second CSI report. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the first CSI report based on the first set of CSI computation times.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring the second set of CSI computation times associated with the second CSI report to be different from the first set of CSI computation times associated with the first CSI report. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the second CSI report based on the second CSI computation time set.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring a rank threshold value associated with the first CSI report based on the first set of parameters. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the first CSI report based on the rank threshold value without including an RI.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring a first set of one or more aperiodic CSI measurement resources configured for aperiodic CSI reporting based on the first set of parameters. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the first CSI report on the one or more aperiodic CSI measurement resources.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving a capability report from the UE; and identifying, from the capability report, a first capability indication for concurrently generating the first CSI report and the second CSI report, a second capability indication for separately generating the first CSI report, a third capability indication for separately generating the second CSI report, or a combination thereof.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first CSI report comprises a wideband CSI report. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending an indication of the first set of parameters and the second set of parameters to the UE.

Drawings

Fig. 1 illustrates an example of a system for wireless communication that supports techniques for simplified Channel State Information (CSI) feedback in accordance with aspects of the disclosure.

Fig. 2 illustrates an example of a wireless communication system that supports techniques for simplified CSI feedback in accordance with aspects of the present disclosure.

Fig. 3 illustrates an example of a signaling scheme supporting techniques for simplifying CSI feedback according to aspects of the present disclosure.

Fig. 4A and 4B illustrate examples of processing diagrams supporting techniques for simplifying CSI feedback according to aspects of the present disclosure.

Fig. 5 through 7 illustrate examples of process flows in a system that supports techniques for simplifying CSI feedback according to aspects of the present disclosure.

Fig. 8 and 9 show schematic diagrams of devices supporting techniques for simplifying CSI feedback according to aspects of the present disclosure.

Fig. 10 shows a schematic diagram of a communication manager supporting techniques for simplified CSI feedback, in accordance with aspects of the present disclosure.

Fig. 11 shows a schematic diagram of a system including devices supporting techniques for simplified CSI feedback, in accordance with aspects of the present disclosure.

Fig. 12 and 13 show schematic diagrams of devices that support techniques for simplified CSI feedback, in accordance with aspects of the present disclosure.

Fig. 14 shows a schematic diagram of a communication manager supporting techniques for simplified CSI feedback, in accordance with aspects of the present disclosure.

Fig. 15 shows a schematic diagram of a system including devices supporting techniques for simplified CSI feedback, in accordance with aspects of the present disclosure.

Fig. 16 through 20 show flow diagrams illustrating methods of supporting techniques for simplifying CSI feedback according to aspects of the present disclosure.

Detailed Description

In some wireless communication systems, a User Equipment (UE) may report Channel State Information (CSI) to a base station. The CSI reporting may involve multiple CSI measurement resources, and the reporting may be configured to be periodic, aperiodic, or semi-persistent. For example, the base station may configure the UE with one or more CSI measurement resources (e.g., resources carrying CSI Reference Signals (RSs)) for aperiodic CSI reporting. However, the UE may not know which CSI resource(s) to measure until after Downlink Control Information (DCI) from the base station triggers an aperiodic CSI report. In particular, the DCI may indicate to the UE the resources to be used for CSI reporting, and the UE may decode the DCI to identify the CSI resources to be used for CSI reporting. Thus, when the UE receives DCI triggering an aperiodic CSI report, the UE may buffer the received signaling (e.g., in active and inactive bandwidth parts (BWPs)) until the DCI is decoded. Such buffering may result in relatively high power consumption and complexity requirements (such as memory size and sampling capability) at the UE. However, for some types of UEs, including low complexity UEs (e.g., UEs with a reduced number of antennas, reduced transmit or receive bandwidth, reduced computational complexity, etc.), such buffering requirements may be limited. Such UEs may be referred to as New Radio (NR) light UEs.

Further, the UE may support CSI reporting using different types of codebooks (e.g., type I single-panel, type I multi-panel, type II, or a combination thereof). The UE may report codebook capabilities to the base station, and the base station considers the codebook capabilities when configuring CSI reports for the UE. The UE may indicate codebook capability information for each codebook type in one or more lists. For example, the list may include a maximum number of transmit antenna ports per CSI resource, a maximum number of CSI resources, and a maximum total number of transmit antenna ports per frequency band. However, low complexity UEs (e.g., NR light UEs) may under-report (under-report) UE capabilities to the base station to maintain support for CSI reporting using one or more codebook types, which may reduce the efficiency of CSI reporting and increase interference to other UEs if the UEs are grouped (e.g., for multi-user (MU) -multiple-input multiple-output (MIMO) transmissions). Accordingly, it may be desirable to utilize techniques for simplifying CSI feedback at a UE.

Thus, the techniques described herein may enable a UE to perform a CSI feedback process according to relaxed buffering requirements for aperiodic CSI reporting, which may allow the UE to reduce the complexity related to CSI feedback, thereby improving power consumption and latency in the system by mitigating the processing burden on the UE. Aspects of the present disclosure provide for the use of a time delay or trigger offset (e.g., CSI measurement resource trigger offset), which may be a time delay between receiving a DCI triggering an aperiodic CSI report and the start of a CSI measurement resource for a corresponding measurement. The UE may not desire to receive a configured CSI Reference Signal (RS) for DCI triggered CSI reporting until after the trigger offset, allowing the UE time to decode the received DCI and reducing the amount of buffering performed by the UE. In other examples, the number of configured aperiodic CSI resources for CSI measurement may be limited, which may allow the UE to buffer less data when decoding DCI (e.g., due to a reduction in the number of resources including CSI-RS that may potentially be used for measurement). Additionally or alternatively, the configuration of the CSI resource may be based on a buffering capability (e.g., size of a memory thereof) reported by the UE, which may be reported in terms of a number of symbol periods used for the reception bandwidth.

Furthermore, CSI reporting using different codebook types (e.g., type I, type II) may be modified to reduce the computational burden on the UE. For example, the UE may utilize priorities associated with different CSI codebook types, wherein the UE may be expected not to support concurrent CSI when at least type II CSI is triggered. In some cases, when the UE is triggered to report CSI associated with a type II codebook and CSI associated with a type I codebook, the UE may identify a priority for each type of CSI report and may process the CSI based on the identified priority. In other examples, the UE may be configured with various parameters (e.g., CSI process time, maximum rank) that relax or modify the processing of type II CSI reports. The UE may also report its capability to support concurrent type I and type II codebook CSI reporting schemes, and the network may configure the UE according to the reported capability. In other cases, the configuration of CSI may be adjusted, where the UE may only configure wideband CSI reporting (where subband CSI may not be supported). The UE may perform simplified CSI reporting, which may result in reduced complexity and power consumption for UE processing, among other benefits.

Aspects of the present disclosure are first described in the context of a wireless communication system. Additional aspects of the disclosure are described with reference to signaling schemes and processing diagrams. Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow diagrams that relate to techniques for simplifying CSI feedback.

Fig. 1 illustrates an example of a wireless communication system 100 that supports techniques for simplifying CSI feedback in accordance with aspects of the disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-advanced (LTE-a) network, an LTE-a Pro network, or an NR network. In some examples, wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low cost and low complexity devices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic region to form the wireless communication system 100 and may be devices of different forms or with different capabilities. The base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 within which coverage area 110 a UE 115 and base station 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographic area within which base stations 105 and UEs 115 may support transmission of signals according to one or more radio access technologies.

UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UE 115 may be a device with different forms or with different capabilities. Some example UEs 115 are shown in fig. 1. The UEs 115 described herein are capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated Access and Backhaul (IAB) nodes, or other network devices), as shown in fig. 1.

The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 over one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 can communicate with each other over the backhaul links 120 (e.g., via X2, xn, or other interfaces) directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130), or both. In some examples, backhaul link 120 may be or include one or more wireless links.

One or more of the base stations 105 described herein may include or may be referred to by those of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a node B, an evolved node B (eNB), a next generation node B or gigabit node B (any of which may be referred to as a gNB), a home node B, a home evolved node B, or other suitable terminology.

The UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, station, terminal, or client, among other examples. The UE 115 may also include or may be referred to as a personal electronic device such as a cellular telephone, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE 115 may include or be referred to as a Wireless Local Loop (WLL) station, an internet of things (IoT) device, an internet of everything (IoE) device, or a Machine Type Communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, among others.

The UEs 115 described herein are capable of communicating with various types of devices, such as other UEs 115 that may sometimes act as relays, as well as base stations 105 and network devices including macro enbs or gnbs, small cell enbs or gnbs, or relay base stations, among other examples, as shown in fig. 1.

The UE 115 and the base station 105 may wirelessly communicate with each other via one or more communication links 125 over one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, the carrier used for communication link 125 may include a portion of the radio frequency spectrum band (e.g., a bandwidth portion (BWP)) operating in accordance with one or more physical layer channels for a given wireless access technology (e.g., LTE-a Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling that coordinates operation for the carriers, user data, or other signaling. The wireless communication system 100 may support communication with the UEs 115 using carrier aggregation or multi-carrier operation. According to a carrier aggregation configuration, a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both Frequency Division Duplex (FDD) component carriers and Time Division Duplex (TDD) component carriers.

In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. The carriers may be associated with frequency channels (e.g., evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel numbers (EARFCNs)) and may be placed according to a channel grid for discovery by UEs 115. The carriers may operate in a standalone mode, where the UE 115 initially acquires and connects via the carrier, or the carriers may operate in a non-standalone mode, where different carriers (e.g., of the same or different radio access technology) are used to anchor the connection.

The communication links 125 shown in the wireless communication system 100 may include uplink transmissions from the UEs 115 to the base stations 105 or downlink transmissions from the base stations 105 to the UEs 115. The carriers may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry downlink and uplink communications (e.g., in TDD mode).

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a carrier or "system bandwidth" of the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) for a carrier of a particular radio access technology. Devices of the wireless communication system 100 (e.g., base stations 105, UEs 115, or both) may have a hardware configuration that supports communication over a particular carrier bandwidth or may be configurable to support communication over one carrier bandwidth of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of the carrier bandwidth.

The signal waveforms transmitted on the carriers may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or discrete fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM technology, a resource element may consist of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further improve data rate or data integrity for communications with the UE 115.

One or more numerologies (numerology) for the carriers may be supported, where the numerology may include a subcarrier spacing (Δ f) and a cyclic prefix. The carrier may be partitioned into one or more BWPs with the same or different digital schemes. In some examples, the UE 115 may be configured with multiple BWPs. In some examples, a single bandwidth portion (BWP) for a carrier may be active at a given time, and communications for the UE 115 may be limited to one or more active BWPs.

The time interval for a base station 105 or UE 115 may be expressed in multiples of a basic unit of time, which may refer to T, for example _s ＝1/(Δf _max ·N _f ) A sampling period of seconds, where Δ f _max May represent the maximum supported subcarrier spacing, and N _f The maximum supported Discrete Fourier Transform (DFT) size may be represented. The time intervals of the communication resources may be based on each havingA radio frame of a specified duration, e.g., 10 milliseconds (ms). Each radio frame may be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

Each frame may include a plurality of consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a plurality of slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix appended in front of each symbol period). In some wireless communication systems 100, a slot may be further divided into a plurality of minislots comprising one or more symbols. Each symbol period may contain one or more (e.g., N) excluding the cyclic prefix _f One) sampling period. The duration of the symbol period may depend on the subcarrier spacing or frequency band of operation.

A subframe, slot, minislot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a Transmission Time Interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of shortened TTIs (sttis)).

The physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and physical data channels may be multiplexed on the downlink carrier, for example, using one or more of Time Division Multiplexing (TDM) techniques, frequency Division Multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of the system bandwidth of a carrier. One or more control regions (e.g., CORESET) may be configured for the set of UEs 115. For example, one or more of UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control Channel Elements (CCEs)) associated with encoded information for a control information format having a given payload size. The set of search spaces may include a common set of search spaces configured for transmitting control information to multiple UEs 115 and a UE-specific set of search spaces for transmitting control information to a particular UE 115.

Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" can refer to a logical communication entity used for communication with the base station 105 (e.g., on a carrier), and can be associated with an identifier (e.g., a Physical Cell Identifier (PCID), a Virtual Cell Identifier (VCID), or other) used to distinguish neighboring cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion (e.g., a sector) of a geographic coverage area 110 over which a logical communication entity operates. Such cells may range from a smaller area (e.g., structure, subset of structure) to a larger area, depending on various factors such as the capabilities of the base station 105. For example, a cell may be or include buildings, a subset of buildings, or an exterior space between geographic coverage areas 110 or overlapping geographic coverage areas 110, among other examples.

A macro cell typically covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a lower power base station 105 than a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 with service subscriptions with a network provider or may provide restricted access to UEs 115 with associations with small cells (e.g., UEs 115 in a Closed Subscriber Group (CSG), UEs 115 associated with users in a home or office). The base station 105 may support one or more cells and may also support communication over one or more cells using one or more component carriers.

In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access for different types of devices.

In some examples, the base stations 105 may be mobile and thus provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, heterogeneous networks in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

The wireless communication network 100 may support synchronous operation or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timings, and transmissions from different base stations 105 may be misaligned in time in some examples. The techniques described herein may be used for synchronous operations or asynchronous operations.

Some UEs 115, such as MTC or IoT devices, may be low cost or low complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication techniques that allow devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communications or MTC may include communications from devices that integrate sensors or meters to measure or capture information, and relay such information to a central server or application that utilizes the information or presents the information to a human interacting with the application. Some UEs 115 may be designed to gather information or to implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, device monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business billing.

Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE 115 include: the power-saving deep sleep mode is entered when not engaged in active communications, when operating on a limited bandwidth (e.g., according to narrowband communications), or when a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or Resource Blocks (RBs)) within a carrier, within a guard band of a carrier, or outside of a carrier.

The wireless communication system 100 may be configured to support ultra-reliable communications or low latency communications, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission critical communication. The UE 115 may be designed to support ultra-reliable, low latency or critical functions (e.g., mission critical functions). The ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission critical services, such as mission critical push-to-talk (MCPTT), mission critical video (MCVideo), or mission critical data (MCData). Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general business applications. The terms ultra-reliable, low latency, mission critical, and ultra-reliable low latency may be used interchangeably herein.

In some examples, the UE 115 may also be capable of communicating directly with other UEs 115 (e.g., using peer-to-peer (P2P) or D2D protocols) over a device-to-device (D2D) communication link 135. One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1 m) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base stations 105.

In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UEs 115). In some examples, the vehicle may communicate using vehicle-to-anything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. The vehicle may signal information related to traffic conditions, signal schedules, weather, safety, emergency, or any other information related to the V2X system. In some examples, a vehicle in a V2X system may communicate with roadside infrastructure, such as roadside units, or with a network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communication, or both.

Core network 130 may provide user authentication, access authorization, tracking, internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 may be an Evolved Packet Core (EPC) or a 5G core (5 GC), which may include at least one control plane entity (e.g., mobility Management Entity (MME), access and mobility management function (AMF)) that manages access and mobility and at least one user plane entity (e.g., serving gateway (S-GW), packet Data Network (PDN) gateway (P-GW), or User Plane Function (UPF)) that routes packets to or interconnects to external networks. The control plane entity may manage non-access stratum (NAS) functionality, such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the core network 130. User IP packets may be transported through a user plane entity, which may provide IP address assignment as well as other functions. The user plane entity may be connected to a network operator IP service 150. The operator IP services 150 may include access to the internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

Some of the network devices (e.g., base stations 105) may include subcomponents such as access network entity 140, which may be examples of an Access Node Controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, intelligent radio heads, or transmission/reception points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or incorporated into a single network device (e.g., base station 105).

Wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300MHz to 3GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range is from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by building and environmental features, but the waves may be sufficiently penetrating the structure for the macro cell to provide service to the UE 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) than the transmission of smaller and longer waves using the High Frequency (HF) or Very High Frequency (VHF) portions of the spectrum below 300 MHz.

The wireless communication system 100 may also operate in the ultra-high frequency (SHF) region using a frequency band from 3GHz to 30GHz (also referred to as the centimeter band) or in the Extremely High Frequency (EHF) region of the spectrum (e.g., from 30GHz to 300 GHz) (also referred to as the millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communication between UEs 115 and base stations 105, and the EHF antennas of the respective devices may be even smaller and more closely spaced compared to UHF antennas. In some examples, this may facilitate the use of an antenna array within a device. However, propagation of EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the specified use of frequency bands across these frequency regions may differ depending on the country or regulatory agency.

The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands, such as the 5GHz industrial, scientific, and medical (ISM) band. When operating in the unlicensed radio frequency spectrum band, devices such as base stations 105 and UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation in the unlicensed band may be configured based on carrier aggregation in conjunction with component carriers operating in the licensed band (e.g., LAA). Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, MIMO communication, or beamforming. The antennas of a base station 105 or a UE 115 may be located in one or more antenna arrays or antennas within a panel (which may support MIMO operation or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with base stations 105 may be located at different geographic locations. The base station 105 may have an antenna array with multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UEs 115. Likewise, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

The base station 105 or the UE 115 may utilize multipath signal propagation using MIMO communication and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Likewise, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (in which multiple spatial layers are transmitted to the same receiving device) and MU-MIMO (in which multiple spatial layers are transmitted to multiple devices).

Beamforming (which may also be referred to as spatial filtering, directional transmission or directional reception) is a signal processing technique that: the techniques may be used at a transmitting device or a receiving device (e.g., base station 105, UE 115) to form or direct an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by: signals transmitted via the antenna elements of the antenna array are combined such that some signals propagating in a particular orientation relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signal transmitted via the antenna element may comprise: either the transmitting device or the receiving device applies an amplitude offset, a phase offset, or both, to the signal carried via the antenna element associated with the device. The adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to an antenna array of a transmitting device or a receiving device, or relative to some other orientation).

As part of the beamforming operation, the base station 105 or the UE 115 may use a beam scanning technique. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) for beamforming operations for directional communication with the UEs 115. The base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device, such as base station 105, or by a receiving device, such as UE 115) to identify a beam direction for subsequent transmission or reception by base station 105.

The base station 105 may transmit some signals (e.g., data signals associated with a particular receiving device (e.g., UE 115)) in a single beam direction (e.g., a direction associated with the receiving device). In some examples, a beam direction associated with a transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, the UE 115 may receive one or more of the signals transmitted in different directions by the base station 105 and may report to the base station 105 an indication of the signal received by the UE 115 having the highest or otherwise acceptable signal quality.

In some examples, transmissions by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may generate a combined beam for transmissions (e.g., from the base station 105 to the UE 115) using a combination of digital precoding or radio frequency beamforming. The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams spanning a system bandwidth or one or more subbands. The base station 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), CSI-RS) that may or may not be precoded. The UE 115 may provide feedback for beam selection, which may be a Precoding Matrix Indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although the techniques are described with reference to signals transmitted by the base station 105 in one or more directions, the UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmission or reception by the UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

When receiving various signals, such as synchronization signals, reference signals, beam selection signals, or other control signals, from the base station 105, a receiving device (e.g., UE 115) may attempt multiple reception configurations (e.g., directional listening). For example, the receiving device may attempt multiple receive directions by receiving via different antenna sub-arrays, by processing received signals according to different antenna sub-arrays, by receiving according to different sets of receive beamforming weights (e.g., different sets of directional listening weights) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (any of the above operations may be referred to as "listening" according to different receive configurations or receive directions). In some examples, a receiving device may receive along a single beam direction (e.g., when receiving data signals) using a single receive configuration. A single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

The wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly for transmission on logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels to transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, a Radio Resource Control (RRC) protocol layer may provide for the establishment, configuration, and maintenance of an RRC connection between the UE 115 and the base station 105 or core network 130 that supports radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels.

The UE 115 and the base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data will be received correctly on the communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward Error Correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer under poor radio conditions (e.g., low signal and noise conditions). In some examples, a device may support same slot HARQ feedback, where the device may provide HARQ feedback in a particular slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

The base station 105 may collect channel condition information from the UEs 115 in order to efficiently configure, schedule channels. This information may be sent from the UE 115 in the form of a channel state report (or CSI report). The channel status report may include: a Rank Indicator (RI) requesting a number of layers to be used for downlink transmission (e.g., based on an antenna port of the UE 115); a Precoding Matrix Indicator (PMI) that indicates a preference for which precoder matrix should be used (e.g., based on the number of layers); and a Channel Quality Indicator (CQI) indicating the highest Modulation and Coding Scheme (MCS) that can be used. The UE 115 may calculate the CQI after receiving predetermined pilot symbols, such as cell-specific reference signals (CRS) or CSI-RS.

In some examples, the type of information included in the CSI report determines the report type. The CSI may be periodic or aperiodic. Furthermore, CSI reports may be of different types based on the codebook used to generate the report. For example, type I CSI reporting may be based on a first codebook and type II CSI reporting may be based on a second codebook, where the first and second codebooks may be based on different antenna configurations. In some cases, using type I or type II CSI reporting may improve MIMO performance (compared to other types of CSI reporting). In some cases, the type II CSI report may be carried on at least the PUSCH and the CSI may be provided to the base station 105 at a relatively high level of granularity (e.g., for MU-MIMO services).

For CSI, there may be an active period defined from the time period (e.g., time slot) in which DCI is triggered to the UE 115 to send a corresponding CSI report. As described herein, in the case of "non-concurrent" CSI reporting, this means that when type 2CSI reporting is active (active), the UE 115 may not update the type I CSI report (alternatively, not update the type II CSI report when the type II CSI report is active), even if the type I and type II CSI reports are not triggered simultaneously. Here, the wireless communication system 100 may support time division multiplexing of CSI processes, wherein the UE 115 may first identify a type of CSI report before updating one or more CSI reports (e.g., which may be further based on a priority of the respective CSI report).

The wireless communication system 100 may support a simplified CSI feedback process. For example, the base station 105 may configure the UE 115 with relaxed buffering requirements for aperiodic CSI reporting. In such a case, the UE 115 may send a capability report to the base station 105 indicating a time delay (e.g., trigger offset). The base station 105 may configure the UE 115 with one or more CSI resources. Further, the base station 105 may send DCI triggering CSI reporting to the UE 115. The UE 115 may perform CSI reporting according to the CSI resources and the trigger offset. The trigger offset may allow the UE 115 time to decode the received DCI, thereby reducing the amount of signal buffering performed by the UE 115. In some examples, the UE 115 may have limited capabilities when compared to other UEs 115 (e.g., the UE 115 may be a low complexity UE 115, which may be referred to as an NR light UE 115). The UE 115 may be a wearable smart device, an industrial sensor, a video surveillance device, or any other device with reduced complexity.

In some cases, the DCI may trigger CSI reporting associated with different codebook types (e.g., type I, type II). CSI reports relating to different codebook types may be modified to reduce the computational burden on the UE 115. For example, the UE 115 may utilize priorities associated with different CSI codebook types. In some cases, when the UE 115 is triggered to report CSI associated with a type-II codebook and CSI associated with a type-I codebook, the UE 115 may identify a priority for each type of CSI report and may process the CSI based on the identified priority. In other examples, the UE 115 may be configured with various parameters (e.g., CSI process time, maximum rank) that relax or modify the processing of type II CSI reports, where the respective parameters may correspond to reporting CSI for different codebook types.

Fig. 2 illustrates an example of a wireless communication system 200 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100, and may include a UE 115-a and a base station 105-a having a coverage area 110-a, which may be examples of the UE 115 and base station 105 described with reference to fig. 1. For example, the UE 115-a and the base station 105-a may transmit and receive control information and data via the communication link 125-a during the signaling window 205. In some cases, the UE 115-a may have reduced capabilities relative to other UEs 115. For example, the UE 115-a may be an NR light UE 115, such as a wearable device, an industrial sensor, a video surveillance device, or the like. Further, the UE 115-a may have a reduced number of receive antennas, a reduced transmit or receive bandwidth (e.g., 5MHz-20 MHz compared to 100MHz bandwidth for other UEs 115), reduced computational complexity and memory, and increased battery life requirements when compared to legacy UEs 115. As described herein, the base station 105-a may configure the UE 115-a according to a simplified CSI feedback process (e.g., to enhance coexistence between UEs 115 operating according to different complexities).

For example, the base station 105-a may configure the UE 115-a to perform aperiodic CSI reporting using one or more CSI resources 210 (e.g., resources carrying aperiodic CSI-RS). In some cases, the base station 105-a may dynamically indicate CSI resources 210 that the UE 115-a may use to perform CSI measurements. For example, the base station 105-a may transmit control information, such as DCI 215, to the UE 115-a. The DCI 215 may trigger an aperiodic CSI report and may indicate corresponding CSI resources 210 (e.g., one or more of CSI resources 210-a, 210-b, 210-c, 210-d, 210-e, 210-f, 210-g, or 210-h) that may be used by the UE 115-a. In some cases, the UE 115-a may not know which CSI resource 210 to perform the measurement until after the DCI 215 triggers an aperiodic CSI report and indicates configured resources to use. Accordingly, UE 115-a may buffer received signaling during signaling duration 220, which may include configured CSI resources 210 received in active BWP 225-a and inactive BWP 225-b. However, buffering data in an immediate manner may result in high memory and sampling capability requirements for UE 115-a.

Further, it may be desirable for the UE 115-a to support CSI reporting using different types of codebooks (e.g., corresponding to codebook capabilities for the UE 115-a). For example, the UE 115-a may support type I single-panel or type I multi-panel CSI feedback. In some cases, the type I CSI feedback may include codebook-based Precoding Matrix Indicator (PMI) feedback with relatively normal spatial resolution. Additionally or alternatively, the UE 115-a may support type II CSI feedback. Type II CSI feedback may be an enhanced feedback scheme that enables explicit feedback or codebook-based feedback with relatively high spatial resolution.

In some cases, the UE 115-a may report codebook capabilities for the bands, including codebook types. For each codebook type, there may be one or more lists. Each list may include parameters indicating codebook capabilities corresponding to the frequency bands. In some examples, the parameters may include a maximum number of ports per CSI resource (maxnumbertxportserresource), a maximum number of CSI resources per band (maxnumbertresourcesband), and a maximum total number of ports per band (totalnumbertxportsparband). The base station 105-a may configure CSI reporting for the UE 115-a in view of the reported capability parameters. In some cases, the UE 115-a may be configured or triggered with multiple types of codebook-based CSI reports, and thus may support concurrent codebooks with mixed types. For example, the UE 115-a may be triggered with a type I single panel or a type I multi-panel and a type II CSI type. Type II CSI may involve relatively more complex computations than type I CSI computations. In such an example, the UE 115-a may underreport the type-II CSI codebook capability, so the base station 105-a may jointly consider one list for type-I CSI and one list for type-II CSI. That is, the UE 115-a may underreport the maximum number of ports, the maximum number of CSI resources (e.g., 2 instead of 4), or the maximum total number of ports (e.g., 8 instead of 16), so that both CSI codebook types may be supported concurrently.

The performance of type II CSI may be limited if the capabilities for type II CSI are underreported (e.g., due to limited complexity at the UE 115-a). For example, reducing the number of beamforming ports or resources for a band may degrade reporting granularity. In some cases, if the UE 115-a supports a type II CSI codebook for CSI reporting, the base station 105-a may pair the UE 115-a (which may be an NR light UE 115) with a UE 115 with higher complexity (e.g., an advanced UE 115) for MU-MIMO. In such a case, under-reporting the type II CSI codebook capability at the UE 115-a may result in higher interference between the UE 115 and the UE 115-a.

As described herein, the wireless communication system 200 may support the use of techniques that relax the buffering capability or processing for type II CSI at the UE 115-a while maintaining performance. For example, and as described in further detail with respect to fig. 3, the UE 115-a may be configured with a time delay or trigger offset (e.g., CSI measurement resource trigger offset), which may be the time between receiving the DCI 215 triggering the aperiodic CSI report and the beginning of the CSI resource 210 for the corresponding measurement. Thus, the UE 115-a may not desire to receive any configured CSI-RS for the CSI report triggered by the DCI 215 until after the trigger offset, allowing the UE 115 time to decode the received DCI 211 and reducing the amount of buffering performed by the UE by 115-a. In other examples, the number of configured aperiodic CSI resources 210 for CSI measurement may be limited, which may allow the UE 115-a to buffer less data when decoding the DCI 215 (e.g., due to a reduction in the number of resources including CSI-RSs that may potentially be used for measurement). Additionally or alternatively, the configuration of the CSI resource 210 may be based on a buffering capability (e.g., a size of a memory thereof) reported by the UE 115-a, which may be reported in terms of a number of symbol periods used for the reception bandwidth.

Further, CSI reporting using different CSI codebook types (e.g., type I, type II) may be modified to reduce the computational burden on the UE 115-a. For example, and as described in further detail with reference to fig. 4A and 4B, the UE 115-a may identify a type of CSI report (e.g., a type of CSI codebook) and further utilize priorities associated with different CSI codebook types, wherein the UE 115-a may be expected not to support concurrent CSI when at least type II CSI is triggered. In some cases, when the UE 115-a is triggered to report CSI associated with a type-II codebook and CSI associated with a type-I codebook, the UE 115-a may identify a priority for each type of CSI report and may process the CSI based on the identified priority. In other examples, the UE 115-a may be configured with various parameters (e.g., CSI process time, maximum rank) that relax or modify the processing of type II CSI reports. The UE 115-a may also report its capability to support concurrent type I and type II CSI codebook reporting schemes, and the base station 105 may configure the UE 115-a according to the reported capability. In other cases, the configuration of CSI may be adjusted, where the UE 115-a may only configure wideband CSI reporting (where subband CSI may not be supported). The UE 115-a may perform simplified CSI reporting, which may reduce complexity and power consumption for UE processing, among other benefits.

Fig. 3 illustrates an example of a signaling scheme 300 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. In some examples, signaling scheme 300 may implement aspects of wireless communication systems 100 and/or 200. For example, the signaling scheme 300 may illustrate BWP 325 where the UE 115 performs CSI measurements based on a configured time delay (e.g., trigger offset 305). Signaling scheme 300 includes CSI resources 310, trigger DCI 315, and BWP 325, which may be respective examples of CSI resources 210, trigger DCI 215, and BWP 225 as described with reference to fig. 2. In some examples, the base station 105 may configure the UE 115 (e.g., via RRC signaling) with one or more aperiodic CSI resources 310 within one or more BWPs 325. For example, the UE 115 may be configured with CSI resource 310-a, CSI resource 310-b, and CSI resource 310-c.

In some cases, the UE 115 may identify a time delay (e.g., the trigger offset 305) based on an indication from the base station 105, a predetermined value, or a UE configuration. In some cases, the UE 115 may report a capability indicating a minimum non-zero trigger offset 305. The trigger offset 305 may be a number of symbols or slots, and the number may be based on the UE processing time used to decode the DCI 315. The trigger offset 305 may be a time between triggering the DCI 315 and the start of an aperiodic CSI resource 310 (e.g., an aperiodic CSI-RS resource associated with aperiodic CSI reporting). In other cases, a slot offset may be added to the aperiodic CSI resource 310. For example, there may be a determined minimum number of slots (e.g., one slot) between triggering the DCI 315 and the start of the aperiodic CSI resource 310. Accordingly, the UE 115 may decode the trigger DCI 315 without buffering one or more CSI measurement resources (e.g., aperiodic CSI resources 310). Once the UE 115 decodes the trigger DCI 315, the UE 115 may identify which aperiodic CSI resources 310 (e.g., CSI resources 310-b or CSI resources 310-c or both) are to be measured for CSI reporting based on information included in the trigger DCI 315. Thus, while the UE 115 may be configured with a set of aperiodic CSI resources 310 (e.g., across one or more BWPs 325), the UE 115 may identify that a subset of CSI resources 310 (e.g., CSI resource 310-b and/or CSI resource 310-c) are to be measured for triggered aperiodic CSI reporting after the trigger offset 305, while the UE 115 may not buffer other configured CSI measurement resources (e.g., CSI resource 310-a) within the trigger offset 305. The UE 115 may then measure the CSI resource 310 and report the CSI to the base station 105. The CSI report may include channel condition information based on measurements of CSI resources 310-b and 310-c, and the channel condition information may be used by base station 105 to modify one or more transmission parameters.

In some cases, the base station 105 may indicate a number of configured aperiodic CSI resources 310 for CSI measurement based on UE capabilities. For example, the UE may indicate a threshold number of CSI measurement resources supported by the UE (e.g., a maximum number of aperiodic CSI resources 310). Indicating the number of configured aperiodic CSI resources 310 may reduce the buffering time for the UE 115. For example, if the UE 115 is configured with a maximum number of aperiodic CSI resources 310, the UE 115 may buffer fewer aperiodic CSI resources 310 (compared to the case where the maximum number of CSI measurement resources is not used). For example, the UE may expect to buffer no more than a maximum number of CSI measurement resources, which may reduce the total buffering time.

In some examples, the UE 115 may report capabilities (e.g., memory size) associated with the buffer memory. For example, the UE 115 may report its memory size in a capability report, which may be indicated in terms of a number of symbols (e.g., a maximum number of symbols) corresponding to the receive bandwidth. The base station 105 may calculate a buffering effort related to the number of symbols and configure the UE 115 with CSI measurement resources according to the UE capabilities.

Fig. 4A and 4B illustrate examples of processing diagrams 400-a and 400-B for a wireless communication system that support techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. In some examples, the processing diagrams 400-a and 400-b may implement aspects of the wireless communication systems 100 and/or 200. For example, the processing diagrams 400-a and 400-b may each illustrate a process by which the UE 115 applies a codebook type for CSI feedback. The processing diagrams 400-a and 400-b include a trigger DCI 415, which may be an example of the trigger DCIs 215 and 315 as described with reference to fig. 2 and 3, respectively.

In some cases, the UE 115 may receive the trigger DCI 415 from the base station 105. The trigger DCI 415 may trigger a type-I CSI report 405 or a type-II CSI report 410, which may be examples of the type-I CSI report and the type-II CSI report described with reference to fig. 2. In some aspects, the UE 115 may be configured to have a larger CSI processing time (e.g., if the UE 115 is an NR light UE 115). For example, for low complexity UEs 115, Z associated with type II CSI reporting ₂ And Z' ₂ May be increased (e.g., associated with Z associated with type I CSI reporting ₂ And Z' ₂ By comparison). Here, Z ₂ And Z' ₂ May refer to time domain duration (e.g., from when UE 115 is configured or triggered with CSI reporting until when UE 115 measures (e.g., Z) ₂ ) Or reporting CSI resources (e.g., Z' ₂ ) Until then time).

In other cases, the UE 115 may not support concurrent type-II CSI reports 410 and type-I CSI reports 405 (e.g., type-I single panel, type-I multi-panel, or other codebook types). In such a case, type I CSI reports 405 and type II CSI reports 410 may be processed according to TDM techniques. As shown with respect to fig. 4A, the UE 115 may receive a triggering DCI 415-a, which may trigger at least a type II CSI report 410. For example, triggering DCI 415-a may trigger type I CSI report 405-a and type II CSI report 410-a. In such a case, UE 115 may identify which CSI report to process based on the number of CSI Processing Units (CPUs) 420 (e.g., CPUs 420-a, 420-b, 420-c, and 420-d) available to process each type of CSI. In such a case, as shown, type II CSI report 410-a may have a higher priority than type I CSI report 405-a, and UE 115 may fill each of CPUs 420 (e.g., CPUs 420-a through 420-d) when updating type II CSI report 410-a. Once CPUs 420-a, 420-b, 420-c, and 420-d are full, UE 115 may not update the type I report to CPU 420, as shown at 425, since no more CPUs are available.

In another example, referring to fig. 4B, type I CSI report 405-B may have a higher priority than type II CSI report 410-B, and a portion (e.g., a subset) of CPU 420 may be occupied by type I CSI report 405. As an illustrative example, type I CSI report 405-b may occupy CPU 420-e and CPU 420-f (but not CPU 420-g and/or CPU 420-h) when generating type I CSI report 405-b. In such a case, if type I CSI report 405-b is triggered concurrently with type II CSI report 410-b, UE 115 may not update type II CSI report 410-b (e.g., as shown at 430) because there may not be enough CPUs 420 available to concurrently update type II CSI report 410-b (e.g., because in one example, a type II CSI report may utilize four CPUs and two of the four CPUs are being used to generate a type I CSI report). In such a case, type II CSI report 410-b may not be updated concurrently because an insufficient number of CPUs are available, and may be updated at a later time (e.g., according to TDM processing techniques), or updates to type II CSI report 410-b may be skipped.

In some examples, the rank for type II CSI report 410 may be limited (e.g., to a value of 1) regardless of the number of receive antennas used and the rank for other codebook types. Accordingly, RI may not be reported for type II CSI report 410, thereby reducing the complexity of type II CSI report 410. The RI for the type I CSI report 405 may be based on the configured maximum MIMO layer. In other examples, type II CSI reporting 410 may be limited for aperiodic CSI reporting using aperiodic CSI resources (e.g., aperiodic CSI-RS resources). For example, UE 115 may not support type II CSI reports 410 for periodic or semi-persistent CSI resources (e.g., so the UE may not calculate type II CSI reports 410 for any periodic or semi-persistent CSI resources, provided some aperiodic CSI reports are triggered).

In some cases, UE 115 may report concurrent codebook capabilities for type-I CSI report 405 and type-II CSI report 410. For example, CSI measurement resources for both type I CSI report 405 and type II CSI report 410 may be measured and calculated at UE 115. The UE 115 may report the codebook capability separately (e.g., whether the UE is configured with type I CSI reporting 405, type II CSI reporting 410, or mixed type CSI). For example, the UE 115 may report different lists for type II CSI reports, type I CSI reports, concurrent type I and type II CSI reports, or a combination thereof. In other cases, for type II CSI report 410, ue 115 may support wideband CSI reporting (e.g., not supporting subband type II CSI reporting).

Fig. 5 illustrates an example of a process flow 500 in a system that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. In some examples, the process flow 500 may implement aspects of the

wireless communication systems

100 and 200. For example, process flow 500 includes a UE 115-b and a base station 105-b, which may be examples of corresponding devices described with reference to FIGS. 1 and 2. In some cases, the UE 115-b may be a UE 115 with reduced capabilities (e.g., reduced number of antennas, reduced computational complexity, reduced operating bandwidth, etc.) as compared to other UEs 115. Process flow 500 may illustrate various techniques that relax the buffering requirements of UE 115, thereby enhancing the CSI feedback process performed by UE 115.

At 505, the UE 115-b may send a capability report and the base station 105-b may receive the capability report indicating an aperiodic CSI measurement resource trigger offset supported by the UE 115-b. For example, the CSI measurement resource trigger offset may be a non-zero time between when a DCI is received (e.g., a DCI that triggers an aperiodic CSI report) and when the first CSI measurement resource is received. In some cases, UE 115-b may include an indication of a minimum amount of time (e.g., a number of symbol periods) corresponding to a CSI measurement resource trigger offset in the capability report. In some cases, the CSI measurement resource trigger offset supported by the UE 115-b may be based on a processing time for DCI decoding by the UE 115-b. In other cases, the CSI measurement resource trigger offset may represent a slot time offset added to the aperiodic CSI reporting process, where a number of slot time intervals (e.g., one or two slots) may be added between receiving the trigger DCI and the aperiodic CSI measurement resource (e.g., CSI-RS). In some cases, the capability report may be per-band codebook capabilities of the UE 115-b.

Additionally or alternatively, the UE 115-b may send a threshold (e.g., maximum) number of aperiodic CSI measurement resources associated with CSI reports that the UE 115-b is capable of measuring within the capability report. In such a case, the maximum number of aperiodic CSI measurement resources may be based on the number of components the UE 115-b is configured to have for processing CSI, or may be related to other capabilities of the UE 115-b. In other examples, UE 115-b may include an indication of the buffer memory size or other similar capabilities of the UE in the capability report.

At 510, the base station 105-b may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering the aperiodic CSI measurement resources, and a combination thereof based on the received capability report.

At 515, the base station 105-b may configure an aperiodic CSI measurement resource for CSI measurements to be performed by the UE 115-b. For example, the configuration may be based on an aperiodic CSI measurement resource trigger offset, where one or more CSI measurement resources may not be configured for transmission until after the aperiodic CSI measurement resource trigger offset (e.g., starting when the trigger DCI is sent). Here, the UE 115-b may expect not to measure the aperiodic CSI measurement resource until after the aperiodic CSI measurement resource triggers an offset. More generally, the base station 105-b may configure the aperiodic CSI resource based on the information included in the capability report. For example, the base station 105-b may configure one or more aperiodic CSI measurement resources based on a buffer memory size, a minimum aperiodic CSI measurement resource, a DCI decoding time supported by the UE 115-b, a maximum number of CSI resources supported by the UE 115-b, and/or the like.

At 520, the base station 105-b may transmit a configuration of one or more aperiodic CSI measurement resources, and the UE 115-b may receive the configuration. At 525, the base station 105-b may transmit DCI, and the UE 115-b may receive DCI that triggers CSI reporting for a first subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources. The DCI may be based on a configuration of one or more aperiodic CSI measurement resources and an aperiodic CSI measurement resource trigger offset.

At 530, the UE 115-b may generate a CSI report based on the received configuration of the one or more CSI measurement resources. For example, the UE 115-b may identify a first subset of CSI-RS resources and perform measurements on the CSI-RS resources to obtain various information for CSI reporting.

At 535, the UE 115-b may send a CSI report and the base station 115-b may receive the CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

Fig. 6 illustrates an example of a process flow 600 in a system that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. In some examples, the process flow 600 may implement aspects of the

wireless communication systems

100 and 200. For example, process flow 600 includes base station 105-c and UE 115-c, each of which may be an example of a corresponding device described with reference to fig. 1, 2, and 5. It should be noted that UE 115-c and base station 105-c may perform aspects of the functions described with reference to process flow 500 and/or process flow 700, as described herein. Thus, although omitted from fig. 6 for the sake of brevity, additional or alternative functions may be performed by the UE 115-c and the base station 105-c in addition to those shown in process flow 600, such as sending capability reports, configuring CSI-RS resources based on UE capabilities, and so forth. Process flow 600 may illustrate an example of a technique to relax processing time for CSI reports (e.g., type II CSI reports) by UE 115-c while maintaining performance of such reports (e.g., to mitigate interference between UEs 115).

At 605, the base station 105-c may transmit a configuration of one or more aperiodic CSI measurement resources (e.g., including CSI-RS), and the UE 115-c may receive the configuration. At 610, the base station 105-c may transmit DCI, and the UE 115-c may receive DCI that triggers a first CSI report (e.g., a type II CSI report) associated with a first type of codebook and a second CSI report (e.g., a type II CSI report) associated with a second type of codebook.

At 615, the UE 115-c may generate one of the first CSI report or the second CSI report using the set of one or more CSI processing units based on the first type of codebook and the second type of codebook. In such a case, the first CSI report may be processed using each CSI processing unit of the set of one or more CSI processing units based on the first type of codebook. Further, the second CSI report may be processed using a CSI processing element subset of the set of one or more CSI processing elements based on the second type of codebook. In other words, a type II CSI report may occupy all CSI processing elements of the UE 115-c, while a type I CSI report may occupy less than all CSI processing elements of the UE 115-c. In such a case, the UE 115-b may determine not to update one CSI report or another CSI report based on identifying the type of codebook.

At 620, the UE 115-c may identify priorities for the first and second CSI reports. As one example, the UE 115-c may first consider the codebook type before checking the CSI priority rules for updating and processing CSI. In such a case, the UE 115-c may identify that the first CSI report (e.g., type II CSI report) has a higher priority than the second CSI report (e.g., type I CSI report). The UE 115-c may then generate the first CSI report based on using each CSI processing unit of the set of one or more CSI processing units, thereby avoiding updating the second CSI report. That is, since all CSI processing units of UE 115-c may be occupied by type II CSI reports, UE 115-c may not update the type I CSI reports, e.g., until a later time when the CSI processing units are unoccupied or available.

Alternatively, the UE 115-c may identify that the second CSI report has a higher priority than the first CSI report, and the UE 115-c may generate the second CSI report based on using a subset of CSI processing elements of the set of one or more CSI processing elements, thereby avoiding updating the first CSI report. Since some of the CSI processing units of UE 115-c may be occupied for processing type I CSI reports, there may not be enough CSI processing units available for processing type II CSI reports (e.g., until a later time). Thus, the UE 115-c may determine not to update the type II CSI report.

At 625, the UE 115-c may send the generated CSI report and the base station 105-c may receive the generated CSI report.

Fig. 7 illustrates an example of a process flow 700 in a system that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. In some examples, flow 700 may implement aspects of

wireless communication systems

100 and 200. For example, process flow 700 includes base station 105-d and UE 115-d, each of which may be an example of a corresponding device described with reference to fig. 1, 2, and 5. It should be noted that UE 115-d and base station 105-d may perform aspects of the functionality described with reference to process flow 500 and/or process flow 600, as described herein. Thus, although omitted from flow 700 for brevity, flow 600 may include additional or alternative features than those shown, such as configuring CSI measurement resources, etc. Process flow 700 may illustrate an example of a technique to relax processing time for CSI reports (e.g., type II CSI reports) by UEs 115-d while maintaining performance of such reports (e.g., to mitigate interference between UEs 115).

At 705, the UE 115-d may send a capability report and the base station 105-d may receive the capability report, the capability report indicating one or more capabilities of the UE 115-d. For example, the UE 115-d may send a capability report that includes a first capability indication of a capability to concurrently generate the first CSI report and the second CSI report, a second capability indication to separately generate the first CSI report, a third capability indication to separately generate the second CSI report, or a combination thereof.

In some cases, at 710, the base station 105-d may configure different sets of parameters for respective CSI reports using different types of codebooks. For example, the base station 105-d may configure a first set of parameters for a first CSI report associated with a first type of codebook (e.g., a type II codebook) and a second set of parameters for a second CSI report associated with a second type of codebook (e.g., a type I single-panel or type I multi-panel codebook). In some cases, the configuration of the first and second sets of parameters may be based on a capability report received from the UE 115-d. For example, the base station 105-d may configure a maximum rank value for type II CSI reporting, or the base station 105-d may limit type II CSI reporting to only aperiodic CSI resources. In another example, type II CSI reporting may be configured to be limited to wideband reporting (and may not be configured for subband reporting).

In any case, at 715, the base station 105-d may transmit a configuration of one or more aperiodic CSI measurement resources, and the UE 115-d may receive the configuration. The configuration may include an indication of the first set of parameters and the second set of parameters.

At 720, the base station 105-d may transmit DCI, and the UE 115-d may receive the DCI, the DCI triggering a first CSI report (e.g., a type II CSI report) associated with a first type of codebook or a second CSI report (e.g., a type I CSI report) associated with a second type of codebook.

At 725, the UE 115-d may optionally identify a first set of CSI computation times associated with the first CSI report from the first set of parameters (e.g., Z for type II CSI as described herein) ₂ And Z' ₂ ) The first set of CSI computation times is different from a second set of CSI computation times associated with a second CSI report. Further, UE 115-d may identify, from the second set of parameters, a second set of CSI computation times associated with the second CSI report (e.g., Z for type I CSI, as described herein) ₂ And Z' ₂ ). Here, the second set of CSI computation times may be different from (e.g., have a shorter duration than) the first set of CSI computation times associated with the type II CSI reports.

Additionally or alternatively, at 730, the UE 115-d may identify a rank threshold value associated with the first CSI report based on the first set of parameters. In other examples, at 735, the UE 115-d may optionally identify a first set of one or more aperiodic CSI measurement resources configured for aperiodic CSI reporting based on the first set of parameters.

At 740, the UE 115-d may generate a first CSI report using the first set of parameters and the first type of codebook, or generate a second CSI report using the second set of parameters and the second type of codebook, or a combination thereof. As described herein, the generated CSI report may be based on the received DCI.

At 745, the UE 115-d may send the first CSI report (e.g., type II CSI report) or the second CSI report (e.g., type I CSI report) or both to the base station 105-d. In such a case, the UE 115-d may send the first CSI report based on the first set of CSI computation times, or send the second channel state information report based on the second set of CSI computation times, or a combination thereof. In some cases, a first CSI report that does not include a rank indicator may be transmitted based on a rank threshold value. In some examples, the first CSI report comprises a wideband CSI report.

Fig. 8 shows a schematic diagram 800 of an apparatus 805 that supports techniques for simplifying CSI feedback, in accordance with aspects of the disclosure. The device 805 may be an example of aspects of a UE 115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 820. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 810 can receive information such as packets associated with various information channels (e.g., control channels, data channels, and information related to techniques for facilitating CSI feedback, etc.), user data, or control information. Information may be passed to other components of the device 805. The receiver 810 may be an example of aspects of the transceiver 1120 described with reference to fig. 11. Receiver 810 can utilize a single antenna or a group of antennas.

The communication manager 815 may perform the following operations: sending a capability report to a base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI triggering a CSI report for a first aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources, the DCI based on a configuration of the one or more aperiodic CSI measurement resources and an aperiodic CSI measurement resource trigger offset; and transmitting, to the base station, a CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

The communication manager 815 may also perform the following operations: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating one of a first CSI report or a second CSI report using a set of one or more CSI processing units based on a first type of codebook and a second type of codebook, wherein the first CSI report is processed using each CSI processing unit of the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of CSI processing units of the set of one or more CSI processing units based on the second type of codebook, or a combination thereof; and transmitting the generated CSI report.

In some examples, the communication manager 815 may also: receiving DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating a first CSI report using a first set of parameters and a first type of codebook, or generating a second CSI report using a second set of parameters and a second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof. The communication manager 815 may be an example of aspects of the communication manager 1110 described herein.

The communication manager 815 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 815 or its subcomponents may be performed by a general purpose processor, a DSP, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

The communication manager 815, or subcomponents thereof, may be physically located at various locations, including being distributed such that some of the functionality is implemented at different physical locations by one or more physical components. In some examples, the communication manager 815, or subcomponents thereof, may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 815 or subcomponents thereof may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in this disclosure, or a combination thereof, in accordance with various aspects of this disclosure.

The transmitter 820 may transmit signals generated by other components of the device 805. In some examples, the transmitter 820 may be collocated with the receiver 810 in a transceiver module. For example, the transmitter 820 may be an example of aspects of the transceiver 1120 described with reference to fig. 11. The transmitter 820 may utilize a single antenna or a group of antennas.

Fig. 9 shows a schematic diagram 900 of a device 905 that supports techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. The device 905 may be an example of aspects of the device 805 or the UE 115 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 940. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 910 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for facilitating CSI feedback, etc.). Information may be passed to other components of device 905. The receiver 910 may be an example of aspects of the transceiver 1120 described with reference to fig. 11. Receiver 910 can utilize a single antenna or a group of antennas.

The communication manager 915 may be an example of aspects of the communication manager 815 as described herein. The communication manager 915 may include a UE capability component 920, a CSI manager 925, a CSI transmission component 930, and a CSI generation component 935. The communication manager 915 may be an example of aspects of the communication manager 1110 described herein.

The actions performed by the communication manager 915 as described herein may be implemented to realize one or more potential advantages. An implementation may enable a UE to report capabilities to a base station. Such reporting may enable techniques for simplifying CSI feedback by using trigger offsets or modifying CSI reports based on different codebook types, which may result in improved UE complexity and more efficient communication (e.g., reduced latency in the system), among other advantages.

Based on implementing reporting as described herein, a processor of a UE or base station (e.g., a processor that controls receiver 910, communication manager 915, transmitter 940, or a combination thereof) may reduce the complexity of the CSI feedback process while ensuring relatively efficient communication. For example, the reporting techniques described herein may utilize time delays or CSI reporting codebook types during the slot format determination process, which may enable reduced signaling overhead and power savings, among other benefits.

UE capability component 920 may send a capability report to the base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE. The CSI manager 925 may receive a configuration of one or more aperiodic CSI measurement resources and DCI triggering a CSI report for a first aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and an aperiodic CSI measurement resource trigger offset.

The CSI manager 925 may receive DCI from a base station, the DCI triggering a first CSI report (e.g., type I CSI) associated with a first type of codebook and a second CSI report (e.g., type II CSI) associated with a second type of codebook different from the first type of codebook. In some examples, the CSI manager 925 may receive DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof.

CSI transmitting component 930 may send a CSI report to the base station indicating measurements on the first aperiodic CSI measurement resource subset. In some examples, CSI transmitting component 930 may transmit the generated CSI report. Additionally or alternatively, CSI transmitting component 930 may send the first CSI report or the second CSI report, or a combination thereof.

CSI generating component 935 may generate one of a first CSI report or a second CSI report using a set of one or more CSI processing units based on a first type of codebook and a second type of codebook, wherein the first CSI report is processed using each CSI processing unit of the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of CSI processing units of the set of one or more CSI processing units based on the second type of codebook, or a combination thereof. In some cases, CSI generating component 935 may generate a first CSI report using the first set of parameters and a first type of codebook, or generate a second CSI report using the second set of parameters and a second type of codebook, or a combination thereof, based on the received DCI.

Transmitter 940 may transmit signals generated by other components of device 905. In some examples, the transmitter 940 may be collocated with the receiver 910 in a transceiver module. For example, the transmitter 940 may be an example of aspects of the transceiver 1120 described with reference to fig. 11. The transmitter 940 may utilize a single antenna or a group of antennas.

Fig. 10 shows a schematic diagram 1000 of a communication manager 1005 supporting techniques for simplifying CSI feedback, in accordance with aspects of the present disclosure. The communication manager 1005 may be an example of aspects of the communication manager 815, the communication manager 915, or the communication manager 1110 described herein. Communications manager 1005 may include a UE capability component 1010, a CSI manager 1015, a CSI transmission component 1020, a CSI generation component 1025, a priority manager 1030, a parameter component 1035, and a rank component 1040. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

UE capability component 1010 may send a capability report to the base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE. In some examples, UE capability component 1010 may send a capability report indicating an aperiodic CSI measurement resource trigger offset, which is a threshold duration after which the UE can receive one or more aperiodic CSI measurement resources relative to receiving DCI.

In some examples, UE capability component 1010 may send a capability report indicating an aperiodic CSI measurement resource trigger offset indicating a processing time supported by the UE for decoding DCI. In some examples, UE capability component 1010 may transmit a capability report indicating a threshold number of aperiodic CSI measurement resources associated with CSI reporting that the UE is capable of measuring, wherein the CSI report includes measurements for at least one of the one or more aperiodic CSI measurement resources up to the threshold number of aperiodic CSI measurement resources.

In some examples, UE capability component 1010 may transmit a capability report including an indication of a buffer memory size, wherein the configuration of the one or more aperiodic CSI measurement resources is based on the buffer memory size. In some examples, UE capability component 1010 may send a capability report including a first capability indication of a UE capability to concurrently generate the first CSI report and the second CSI report, a second capability indication to separately generate the first CSI report, a third capability indication to separately generate the second CSI report, or a combination thereof. In some cases, the aperiodic CSI measurement resource trigger offset indicates one or more symbol periods, one or more slot durations, or a combination thereof. In some cases, the threshold number of aperiodic CSI measurement resources indicates a maximum number of aperiodic CSI measurement resources associated with CSI reporting that the UE is capable of measuring. In some cases, the CSI report comprises an aperiodic CSI report.

The CSI manager 1015 can receive a configuration of one or more aperiodic CSI measurement resources. In some examples, CSI manager 1015 may receive DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources, the DCI based on a configuration of the one or more aperiodic CSI measurement resources and an aperiodic CSI measurement resource trigger offset. In some examples, CSI manager 1015 may receive DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook.

Additionally or alternatively, CSI manager 1015 may receive DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof. In some examples, CSI manager 1015 may refrain from updating the second CSI report based on generating a first CSI report using each CSI process element of the set of one or more CSI process elements, wherein transmitting the generated CSI report includes transmitting the first CSI report.

In some examples, CSI manager 1015 may refrain from updating the first CSI report based on generating a second CSI report using a subset of CSI processing elements of the set of one or more CSI processing elements, wherein transmitting the generated CSI report includes transmitting the second CSI report. In some examples, CSI manager 1015 may identify a first set of one or more aperiodic CSI measurement resources configured for aperiodic CSI reporting based on the first set of parameters. In some cases, the first type of codebook comprises a type II CSI codebook. In some cases, the first CSI report comprises a wideband CSI report.

CSI transmitting component 1020 may send a CSI report to the base station indicating measurements on the first aperiodic CSI measurement resource subset. In some examples, CSI transmitting component 1020 may transmit the generated CSI report. Additionally or alternatively, CSI transmitting component 1020 may send the first CSI report or the second CSI report, or a combination thereof. In some examples, CSI transmitting component 1020 may transmit a first CSI report generated based on measurements of one or more aperiodic CSI measurement resources.

In some examples, CSI transmitting component 1020 may send the first CSI report based on the first set of CSI computation times. In some examples, CSI transmitting component 1020 may send the second CSI report based at least in part on the second set of CSI computation times. In some cases, CSI transmitting component 1020 may send a first CSI report that does not include a rank indicator based on a rank threshold value.

CSI generating component 1025 may generate one of a first CSI report or a second CSI report using the set of one or more CSI processing units based on the first type of codebook and the second type of codebook, wherein the first CSI report is processed using each CSI processing unit of the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of CSI processing units of the set of one or more CSI processing units based on the second type of codebook, or a combination thereof.

In some examples, CSI generating component 1025 may generate a first CSI report using a first set of parameters and a first type of codebook, or a second CSI report using a second set of parameters and a second type of codebook, or a combination thereof, based on the received DCI.

The priority manager 1030 may identify that the first CSI report has a higher priority than the second CSI report. In some examples, priority manager 1030 may identify that the second CSI report has a higher priority than the first CSI report.

Parameter component 1035 may identify, from the first set of parameters, a first set of CSI computation times associated with the first CSI report that is different from a second set of CSI computation times associated with the second CSI report. In some examples, parameter component 1035 may identify, from the second set of parameters, a second set of CSI computation times associated with a second CSI report that is different from the first set of CSI computation times associated with the first CSI report.

In some examples, parameter component 1035 may receive an indication of the first set of parameters and the second set of parameters from a base station. In some cases in the case of the above-described situation, at least a portion of the first set of parameters is different from the second set of parameters. Rank component 1040 may identify a rank threshold value associated with the first CSI report based on the first set of parameters.

Fig. 11 shows a schematic diagram of a system 1100 including a device 1105 supporting techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. Device 1105 may be an example of or include components of device 805, device 905, or UE 115 as described herein. Device 1105 may include components for bi-directional voice and data communications, including components for sending and receiving communications, including a communications manager 1110, an I/O controller 1115, a transceiver 1120, an antenna 1125, a memory 1130, and a processor 1140. These components may communicate electronically over one or more buses, such as bus 1145.

Communication manager 1110 may: transmitting a capability report to a base station indicating aperiodic CSI measurement resource trigger offset supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources, the DCI being based on a configuration of the one or more aperiodic CSI measurement resources and an aperiodic CSI measurement resource trigger offset; and transmitting, to the base station, a CSI report indicating measurements on the first aperiodic CSI measurement resource subset.

Communication manager 1110 may also perform the following operations: receiving DCI from a base station, the DCI triggering a first CSI report associated with a codebook of a first type and a second CSI report associated with a codebook of a second type different from the codebook of the first type; generating one of a first CSI report or a second CSI report using a set of one or more CSI processing units based on a first type of codebook (e.g., a type-I codebook) and a second type of codebook (e.g., a type-II codebook), wherein the first CSI report is processed using each CSI processing unit of the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of CSI processing units of the set of one or more CSI processing units based on the second type of codebook, or a combination thereof; and transmitting the generated CSI report.

In some examples, communication manager 1110 may also: receiving DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating a first CSI report using a first set of parameters and a first type of codebook, or generating a second CSI report using a second set of parameters and a second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

I/O controller 1115 may manage input and output signals for device 1105. I/O controller 1115 may also manage peripheral devices that are not integrated into device 1105. In some cases, I/O controller 1115 may represent a physical connection or port to an external peripheral device. In some cases, I/O controller 1115 may utilize, for example

Or another known operating system. In other cases, I/O controller 1115 may represent, or interact with, a modem, a keyboard, a mouse, a touch screen, or similar device. In some cases, I/O controller 1115 may be implemented as part of a processor. In some cases, a user may interact with device 1105 via I/O controller 1115 or via hardware components controlled through I/O controller 1115.

The transceiver 1120 may communicate bi-directionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1120 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1120 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission and to demodulate packets received from the antenna. In some cases, the wireless device may include a single antenna 1125. However, in some cases, the device may have more than one antenna 1125 capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 1130 may include a Random Access Memory (RAM) and a Read Only Memory (ROM). The memory 1130 may store computer-readable, computer-executable code 1135 comprising instructions that, when executed, cause the processor to perform various functions described herein. In some cases, memory 1130 may contain, among other things, a basic input/output system (BIOS) that may control basic hardware or software operations such as interaction with peripheral components or devices.

Processor 1140 may include intelligent hardware devices (e.g., general purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1140 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause device 1105 to perform various functions (e.g., functions or tasks that support techniques for simplifying CSI feedback).

Code 1135 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. Code 1135 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1135 may not be directly executable by the processor 1140, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 12 shows a schematic diagram 1200 of an apparatus 1205 that supports techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. The device 1205 may be an example of aspects of a base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1220. The device 1205 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

Receiver 1210 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for facilitating CSI feedback, etc.). Information may be passed to other components of the device 1205. The receiver 1210 may be an example of aspects of the transceiver 1520 described with reference to fig. 15. Receiver 1210 can utilize a single antenna or a group of antennas.

The communications manager 1215 may: receiving, from a UE, a capability report comprising an indication of CSI reporting capabilities supported by the UE; identifying a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report; transmitting a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of aperiodic CSI measurement resources or a UE memory size, or a combination thereof; and transmitting DCI to the UE, the DCI triggering CSI reporting for a subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources.

The communications manager 1215 may also the following operations are carried out: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; sending DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, a first CSI report or a second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on a first set of parameters, the second CSI report is based on a second set of parameters, or a combination thereof. The communication manager 1215 may be an example of aspects of the communication manager 1510 described herein.

The communication manager 1215, or subcomponents thereof, may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1215, or subcomponents thereof, may be performed by a general purpose processor, a DSP, an Application Specific Integrated Circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

The communication manager 1215, or subcomponents thereof, may be physically located at various locations, including being distributed such that some of the functionality is implemented at different physical locations by one or more physical components. In some examples, the communication manager 1215, or subcomponents thereof, may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 1215, or subcomponents thereof, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in this disclosure, or combinations thereof, in accordance with various aspects of the present disclosure.

Transmitter 1220 may transmit signals generated by other components of device 1205. In some examples, the transmitter 1220 may be collocated with the receiver 1210 in a transceiver module. For example, the transmitter 1220 may be an example of aspects of the transceiver 1520 described with reference to fig. 15. Transmitter 1220 may utilize a single antenna or a group of antennas.

Fig. 13 shows a schematic diagram 1300 of a device 1305 supporting techniques for simplifying CSI feedback, in accordance with aspects of the present disclosure. The device 1305 may be an example of aspects of a device 1205 or a base station 105 as described herein. Device 1305 may include a receiver 1310, a communication manager 1315, and a transmitter 1345. The device 1305 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 1310 can receive information such as packets associated with various information channels (e.g., control channels, data channels, and information related to techniques for simplifying CSI feedback, etc.), user data, or control information. Information may be communicated to other components of the device 1305. The receiver 1310 may be an example of aspects of the transceiver 1520 described with reference to fig. 15. Receiver 1310 may utilize a single antenna or a group of antennas.

The communication manager 1315 may be an example of aspects of the communication manager 1215 as described herein. The communication manager 1315 may include a capability manager 1320, a CSI measurement resource manager 1325, a configuration manager 1330, a CSI trigger manager 1335, and a CSI report manager 1340. The communication manager 1315 may be an example of aspects of the communication manager 1510 described herein.

Capability manager 1320 may receive a capability report from a UE that includes an indication of CSI reporting capabilities supported by the UE. The CSI measurement resource manager 1325 may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report.

Configuration manager 1330 can send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by a UE based on a threshold number of aperiodic CSI measurement resources or a UE memory size, or a combination thereof. Configuration manager 1330 may configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook.

CSI trigger manager 1335 may send DCI to the UE, the DCI triggering CSI reporting for a subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources. Additionally or alternatively, the CSI trigger manager 1335 may send DCI to the UE, the DCI triggering the first CSI report or the second CSI report, or a combination thereof.

The CSI reporting manager 1340 may receive a first CSI report or a second CSI report or a combination thereof based on the received DCI from the UE, wherein the first CSI report is based on a first set of parameters, the second CSI report is based on a second set of parameters, or a combination thereof.

A transmitter 1345 may transmit signals generated by other components of the device 1305. In some examples, the transmitter 1345 may be collocated with the receiver 1310 in a transceiver module. For example, the transmitter 1345 may be an example of aspects of the transceiver 1520 described with reference to fig. 15. The transmitter 1345 may utilize a single antenna or a group of antennas.

Fig. 14 shows a schematic diagram 1400 of a communication manager 1405 supporting techniques for simplifying CSI feedback, in accordance with aspects of the present disclosure. The communication manager 1405 may be an example of aspects of the communication manager 1215, the communication manager 1315, or the communication manager 1510 described herein. The communication manager 1405 may include a capability manager 1410, a CSI measurement resource manager 1415, a configuration manager 1420, a CSI trigger manager 1425, a CSI report manager 1430, a calculation time manager 1435, and a parameter manager 1440. Each of these modules may communicate with each other directly or indirectly (e.g., over one or more buses).

The capability manager 1410 may receive, from the UE, a capability report including an indication of CSI reporting capabilities supported by the UE. In some examples, the capability manager 1410 may receive a capability report from the UE. In some examples, capability manager 1410 may identify, from the capability reports, a first capability indication for concurrently generating the first CSI report and the second CSI report, a second capability indication for separately generating the first CSI report, a third capability indication for separately generating the second CSI report, or a combination thereof. In some cases, the received capability report includes an indication of a UE memory size, wherein the UE memory size indicates one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic CSI measurement resources.

The CSI measurement resource manager 1415 may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering the aperiodic CSI measurement resources, or a combination thereof based on the received capability report. In some examples, the CSI measurement resource manager 1415 may configure a first set of one or more aperiodic CSI measurement resources based on a first set of parameters, the first set of one or more aperiodic CSI measurement resources configured for aperiodic CSI reporting. In some cases, the threshold number of aperiodic CSI measurement resources indicates a maximum number of aperiodic CSI measurement resources associated with CSI reporting that the UE is capable of measuring.

Configuration manager 1420 may send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE based on a threshold number of aperiodic CSI measurement resources or a UE memory size, or a combination thereof. In some examples, configuration manager 1420 may configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook. In some examples, the configuration manager 1420 may configure a rank threshold value associated with the first CSI report based on the first set of parameters. In some cases, the first type of codebook comprises a type II CSI codebook.

The CSI trigger manager 1425 may transmit DCI to the UE, the DCI triggering CSI reporting for an aperiodic CSI measurement resource subset of the one or more aperiodic CSI measurement resources. In some examples, the CSI trigger manager 1425 may send DCI to the UE, the DCI triggering the first CSI report or the second CSI report, or a combination thereof.

The CSI report manager 1430 may receive, from the UE, a first CSI report based on the first set of parameters, a second CSI report based on the second set of parameters, or a combination thereof based on the received DCI, or a combination thereof. In some examples, CSI reporting manager 1430 may receive the first CSI report on one or more aperiodic CSI measurement resources. In some cases, the first CSI report comprises a wideband CSI report.

In some examples, CSI reporting manager 1430 may receive the first CSI report based at least in part on the first set of CSI computation times. In some examples, CSI reporting manager 1430 may receive the second CSI report based at least in part on the second set of CSI computation times. In some cases, CSI report manager 1430 may receive a first CSI report that does not include a rank indicator based at least in part on a rank threshold value.

The computation time manager 1435 may configure a first set of CSI computation times associated with the first CSI report that is different from a second set of CSI computation times associated with the second CSI report. In some examples, the computation time manager 1435 may configure a second set of CSI computation times associated with a second CSI report that is different from a first set of CSI computation times associated with a first CSI report.

The parameter manager 1440 may send an indication of the first set of parameters and the second set of parameters to the UE. In some cases, at least a portion of the first set of parameters is different from the second set of parameters.

Fig. 15 shows a schematic diagram of a system 1500 including a device 1505 that supports techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. Device 1505 may be an example of, or include components of, device 1205, device 1305, or base station 105 as described herein. The device 1505 may include components for bi-directional voice and data communications, including components for sending and receiving communications, including a communications manager 1510, a network communications manager 1515, a transceiver 1520, an antenna 1525, memory 1530, a processor 1540, and an inter-station communications manager 1545. These components may be in electronic communication via one or more buses, such as bus 1550.

The communication manager 1510 may perform the following operations: receiving, from a UE, a capability report comprising an indication of CSI reporting capabilities supported by the UE; identifying a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report; transmitting a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of aperiodic CSI measurement resources or a UE memory size, or a combination thereof; and transmitting DCI to the UE, the DCI triggering CSI reporting for a subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources.

Additionally or alternatively, the communication manager 1510 may also: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; sending DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, a first CSI report or a second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on a first set of parameters, the second CSI report is based on a second set of parameters, or a combination thereof.

The network communications manager 1515 may manage communications with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1515 may manage communication of data communications for client devices (e.g., one or more UEs 115).

The transceiver 1520 may communicate bi-directionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1520 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1520 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission and to demodulate packets received from the antenna. In some cases, the wireless device may include a single antenna 1525. However, in some cases, a device may have more than one antenna 1525, which can send or receive multiple wireless transmissions simultaneously.

The memory 1530 may include RAM, ROM, or a combination thereof. The memory 1530 may store computer readable code 1535 comprising instructions that, when executed by the processor (e.g., processor 1540), cause the device to perform various functions described herein. In some cases, memory 1530 may contain, among other things, a BIOS that may control basic hardware or software operations such as interaction with peripheral components or devices.

Processor 1540 may include intelligent hardware devices (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1540 may be configured to operate the memory array using a memory controller. In some cases, a memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause device 1505 to perform various functions (e.g., functions or tasks that support techniques for simplifying CSI feedback).

The inter-station communication manager 1545 may manage communication with other base stations 105 and may include a controller or scheduler for controlling communication with UEs 115 in coordination with the other base stations 105. For example, the inter-station communication manager 1545 may coordinate scheduling of transmissions to the UEs 115 for various interference mitigation techniques (such as beamforming or joint transmission). In some examples, the inter-station communication manager 1545 may provide an X2 interface within LTE/LTE-a wireless communication network technology to provide communication between base stations 105.

The code 1535 may include instructions for implementing aspects of the disclosure, including instructions for supporting wireless communications. The code 1535 may be stored in a non-transitory computer-readable medium, such as system memory or other type of memory. In some cases, the code 1535 may not be directly executable by the processor 1540, but may cause the computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 16 shows a flow diagram illustrating a method 1600 of supporting techniques for simplified CSI feedback in accordance with aspects of the present disclosure. The operations of method 1600 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of method 1600 may be performed by a communication manager as described with reference to fig. 8-11. In some examples, the UE may execute the set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may perform aspects of the functions described herein using dedicated hardware.

At 1605, the UE may send a capability report to the base station indicating aperiodic CSI measurement resource trigger offsets supported by the UE. 1605 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1605 may be performed by the UE capabilities component as described with reference to fig. 8-11.

At 1610, the UE may receive a configuration of one or more aperiodic CSI measurement resources. 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by a CSI manager as described with reference to fig. 8-11.

At 1615, the UE may receive DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources, the DCI being based on a configuration of the one or more aperiodic CSI measurement resources and an aperiodic CSI measurement resource trigger offset. 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a CSI manager as described with reference to fig. 8-11.

At 1620, the UE may send a CSI report to the base station indicating measurements for the first aperiodic CSI measurement resource subset. 1620 may be performed according to methods described herein. In some examples, aspects of the operations of 1620 may be performed by a CSI transmission component as described with reference to fig. 8-11.

Fig. 17 shows a flow diagram of a method 1700 that supports techniques for simplifying CSI feedback, in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of method 1700 may be performed by a communication manager as described with reference to fig. 8-11. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may perform aspects of the functions described herein using dedicated hardware.

At 1705, the UE may receive DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook. 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a CSI manager as described with reference to fig. 8-11.

At 1710, the UE may generate one of a first CSI report or a second CSI report using a set of one or more CSI processing units based on the first type of codebook and the second type of codebook, wherein the first CSI report is processed using each CSI processing unit of the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of CSI processing units of the set of one or more CSI processing units based on the second type of codebook, or a combination thereof. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by the CSI generation component as described with reference to fig. 8-11.

At 1715, the UE may send the generated CSI report. 1715 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1715 may be performed by the CSI transmission component as described with reference to fig. 8-11.

Fig. 18 shows a flow diagram of a method 1800 that supports techniques for simplifying CSI feedback, in accordance with aspects of the disclosure. The operations of method 1800 may be implemented by UE 115 or components thereof as described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to fig. 8-11. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may perform aspects of the functions described herein using dedicated hardware.

At 1805, the UE may receive DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof. 1805 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1805 may be performed by a CSI manager as described with reference to fig. 8-11.

At 1810, the UE may generate a first CSI report using a first set of parameters and a first type of codebook, or generate a second CSI report using a second set of parameters and a second type of codebook, or a combination thereof, based on the received DCI. 1810 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a CSI generation component as described with reference to fig. 8-11.

At 1815, the UE may send the first CSI report or the second CSI report, or a combination thereof. 1815 may be performed according to the methods described herein. In some examples, aspects of the operation of 1815 may be performed by a CSI transmission component as described with reference to fig. 8-11.

Fig. 19 shows a flow diagram of a method 1900 that supports techniques for simplifying CSI feedback in accordance with aspects of the disclosure. The operations of method 1900 may be performed by a base station 105 or components thereof as described herein. For example, the operations of method 1900 may be performed by a communication manager as described with reference to fig. 12-15. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may perform aspects of the functions described herein using dedicated hardware.

At 1905, the base station may receive a capability report from the UE including an indication of CSI reporting capabilities supported by the UE. 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by a capability manager as described with reference to fig. 12-15.

At 1910, the base station may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report. 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by a CSI measurement resource manager as described with reference to fig. 12-15.

At 1915, the base station may send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration based on a threshold number of aperiodic CSI measurement resources or a UE memory size, or a combination thereof. 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by a configuration manager as described with reference to fig. 12-15.

At 1920, the base station may transmit DCI to the UE, the DCI triggering CSI reporting for a subset of aperiodic CSI measurement resources of the one or more aperiodic CSI measurement resources. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed by the CSI trigger manager as described with reference to fig. 12-15.

Fig. 20 shows a flow diagram of a method 2000 that supports techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. The operations of method 2000 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of method 2000 may be performed by a communication manager as described with reference to fig. 12-15. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may perform aspects of the functions described herein using dedicated hardware.

At 2005, a base station may configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook. 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be performed by a configuration manager as described with reference to fig. 12-15.

At 2010, the base station may send DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof. 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by a CSI trigger manager as described with reference to fig. 12-15.

At 2015, the base station may receive, from the UE, a first CSI report or a second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on a first set of parameters, the second CSI report is based on a second set of parameters, or a combination thereof. The operations of 2015 may be performed according to methods described herein. In some examples, aspects of the operations of 2015 may be performed by a CSI reporting manager as described with reference to fig. 12-15.

It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, as well as other implementations being possible. Further, aspects from two or more of the methods may be combined.

Although aspects of the LTE, LTE-A Pro or NR system may be described for purposes of example, and LTE, LTE-A Pro or NR terminology may be used in much of the description, the techniques described herein are applicable outside of LTE, LTE-A Pro or NR networks. For example, the described techniques may be applicable to various other wireless communication systems such as Ultra Mobile Broadband (UMB), institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, flash OFDM, and other systems and radio technologies not explicitly mentioned herein.

The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a Digital Signal Processor (DSP) and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and the following claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard-wired, or a combination of any of these. Features implementing functions may also be physically located at various locations, including being distributed such that some of the functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer data storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Non-transitory storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically Erasable Programmable ROM (EEPROM), flash memory, compact Disc (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs usually reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein (including in the claims), the term "and/or" when used in an item list of two or more items means that any one of the listed items can be employed individually or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components a, B, and/or C, the composition may contain: only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B and C. As used herein (including in the claims), a "or" (e.g., a list of items prefaced by a phrase such as "at least one of or" one or more of) as used in a list of items indicates a disjunctive list such that, for example, a list of "at least one of a, B, or C" means a or B or C or AB or AC or BC or ABC (i.e., a and B and C).

In the drawings, similar components or features may have the same reference numerals. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference labels.

The description set forth herein in connection with the drawings describes example configurations and is not intended to represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and is not "preferred over" or "advantageous over" other examples. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in schematic form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communications at a User Equipment (UE), comprising:

transmitting a capability report to a base station indicating aperiodic channel state information measurement resource trigger offsets supported by the UE;

receiving a configuration of one or more aperiodic channel state information measurement resources;

receiving downlink control information triggering a channel state information report for a first subset of aperiodic channel state information measurement resources of the one or more aperiodic channel state information measurement resources, the downlink control information being based at least in part on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource trigger offset; and

transmitting a channel state information report to the base station, the channel state information report indicating measurements of the first aperiodic subset of channel state information measurement resources.

2. The method of claim 1, wherein transmitting the capability report comprises:

sending the capability report indicating the aperiodic channel state information measurement resource trigger offset, the aperiodic channel state information measurement resource trigger offset being a threshold duration after which the UE is able to receive the one or more aperiodic channel state information measurement resources relative to receiving the downlink control information.

3. The method of claim 1, wherein transmitting the capability report comprises:

transmitting the capability report indicating the aperiodic channel state information measurement resource trigger offset indicating a processing time supported by the UE for decoding the downlink control information.

4. The method of claim 1, wherein the aperiodic channel state information measurement resource triggering offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.

5. The method of claim 1, wherein transmitting the capability report comprises:

transmitting the capability report indicating a threshold number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring, wherein the channel state information report includes a measurement of at least one of the one or more aperiodic channel state information measurement resources for up to the threshold number of aperiodic channel state information measurement resources.

6. The method of claim 5, wherein the threshold number of aperiodic channel state information measurement resources indicates a maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE can measure.

7. The method of claim 1, wherein transmitting the capability report comprises:

transmitting the capability report including an indication of a buffer memory size, wherein the configuration of the one or more aperiodic channel state information measurement resources is based at least in part on the buffer memory size.

8. The method of claim 1, in which the channel state information report comprises an aperiodic channel state information report.

9. A method for wireless communications at a User Equipment (UE), comprising:

receiving downlink control information from a base station, the downlink control information triggering a first channel state information report associated with a first type of codebook and a second channel state information report associated with a second type of codebook different from the first type of codebook;

generating one of the first channel state information report or the second channel state information report using a set of one or more channel state information processing units based at least in part on the first type of codebook and the second type of codebook, wherein, the first channel state information report is processed using each channel state information processing unit of the set of one or more channel state information processing units based at least in part on the first type of codebook, or wherein the second channel state information report is processed using a subset of channel state information processing units of the set of one or more channel state information processing units based at least in part on the second type of codebook, or a combination thereof; and

transmitting the generated channel state information report.

10. The method of claim 9, further comprising:

identifying that the first channel state information report has a higher priority than the second channel state information report;

refraining from updating the second channel state information report based at least in part on generating the first channel state information report using each channel state information processing unit of the set of one or more channel state information processing units, wherein transmitting the generated channel state information report comprises; and

and sending the first channel state information report.

11. The method of claim 9, further comprising:

identifying that the second channel state information report has a higher priority than the first channel state information report;

refraining from updating the first channel state information report based at least in part on generating the second channel state information report using the subset of channel state information processing units in the set of one or more channel state information processing units, wherein transmitting the generated channel state information report comprises; and

and sending the second channel state information report.

12. The method of claim 9, wherein the first type of codebook comprises a type II channel state information codebook.

13. A method for wireless communications at a User Equipment (UE), comprising:

receiving downlink control information triggering a first channel state information report associated with a first type of codebook, or a second channel state information report associated with a second type of codebook different from the first type of codebook, or a combination thereof;

generating the first channel state information report using a first set of parameters and the first type of codebook, or generating the second channel state information report using a second set of parameters and the second type of codebook, or a combination thereof, based at least in part on the received downlink control information; and

transmitting the first channel state information report or the second channel state information report or a combination thereof.

14. The method of claim 13, wherein generating the first channel state information report comprises:

identifying, from the first set of parameters, a first set of channel state information computation times associated with the first channel state information report that is different from a second set of channel state information computation times associated with the second channel state information report, the method further comprising:

transmitting the first channel state information report based at least in part on the first channel state information computation time set.

15. The method of claim 14, wherein generating the second channel state information report comprises:

identifying, from the second set of parameters, the second set of channel state information computation times associated with the second channel state information report that is different from the first set of channel state information computation times associated with the first channel state information report, the method further comprising:

transmitting the second channel state information report based at least in part on the second channel state information computation time set.

16. The method of claim 13, wherein generating the first channel state information report comprises:

identifying a rank threshold value associated with the first channel state information report based at least in part on the first set of parameters, the method further comprising:

transmitting the first channel state information report without a rank indicator based at least in part on the rank threshold value.

17. The method as set forth in claim 13, wherein, further comprising:

identifying a first set of one or more aperiodic channel state information measurement resources configured for aperiodic channel state information reporting based at least in part on the first set of parameters, the method further comprising:

transmitting the first channel state information report, the first channel state information report generated based at least in part on measurements of the one or more aperiodic channel state information measurement resources.

18. The method of claim 13, further comprising:

sending a capability report, the capability report comprising: a first capability indication of a UE capability to concurrently generate the first channel state information report and the second channel state information report, a second capability indication to separately generate the first channel state information report, a third capability indication to separately generate the second channel state information report, or a combination thereof.

19. The method of claim 13, wherein the first channel state information report comprises a wideband channel state information report.

20. The method of claim 13, further comprising:

receiving, from a base station, an indication of the first set of parameters and the second set of parameters.

21. The method of claim 13, wherein the first type of codebook comprises a type II channel state information codebook.

22. The method of claim 13, wherein at least a portion of the first set of parameters is different from the second set of parameters.

23. A method for wireless communications at a base station, comprising:

receiving, from a User Equipment (UE), a capability report comprising an indication of channel state information reporting capabilities supported by the UE;

identifying a threshold number of aperiodic channel state information measurement resources, a UE memory size associated with buffering the aperiodic channel state information measurement resources, or a combination thereof based at least in part on the received capability report;

transmitting a configuration of one or more aperiodic channel state information measurement resources for channel state information reporting by the UE, the configuration based at least in part on a threshold number of the aperiodic channel state information measurement resources or the UE memory size, or a combination thereof; and

sending downlink control information to the UE, the downlink control information triggering the channel state information report for a subset of aperiodic channel state information measurement resources of the one or more aperiodic channel state information measurement resources.

24. The method of claim 23, wherein the received capability report includes an indication of the UE memory size, wherein, the UE memory size indicates one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic channel state information measurement resources.

25. The method of claim 23, wherein the threshold number of aperiodic channel state information measurement resources indicates a maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring.

26. A method for wireless communications at a base station, comprising:

configuring a first set of parameters for a first channel state information report associated with a first type of codebook and a second set of parameters for a second channel state information report associated with a second type of codebook different from the first type of codebook;

transmitting downlink control information to a User Equipment (UE), the downlink control information triggering the first channel state information report or the second channel state information report, or a combination thereof; and

receive, from the UE, the first channel state information report or the second channel state information report, or a combination thereof, based at least in part on the received downlink control information, wherein the first channel state information report is based at least in part on the first set of parameters, the second channel state information report is based at least in part on the second set of parameters, or a combination thereof.

27. The method of claim 26, further comprising:

configuring a first set of channel state information computation times associated with the first channel state information report that is different from a second set of channel state information computation times associated with the second channel state information report, the method further comprising:

receiving the first channel state information report that calculates a set of times based at least in part on the first channel state information.

28. The method of claim 27, further comprising:

configuring the second set of channel state information computation times associated with the second channel state information report to be different from the first set of channel state information computation times associated with the first channel state information report, the method further comprising:

receiving is based at least in part on the second channel state information calculating the second channel state information report for a set of times.

29. The method of claim 26, further comprising:

configure a rank threshold value associated with the first channel state information report based at least in part on the first set of parameters, the method further comprising:

receiving the first channel state information report based at least in part on the rank threshold value without including a rank indicator.

30. The method of claim 26, further comprising:

configuring a first set of one or more aperiodic channel state information measurement resources configured for aperiodic channel state information reporting based at least in part on the first set of parameters, the method further comprising:

receiving the first channel state information report on the one or more aperiodic channel state information measurement resources.

31. The method of claim 26, further comprising:

receiving a capability report from the UE; and

identifying, from the capability report, a first capability indication for concurrently generating the first channel state information report and the second channel state information report, a second capability indication for separately generating the first channel state information report, a third capability indication for separately generating the second channel state information report, or a combination thereof.

32. The method of claim 26, wherein the first channel state information report comprises a wideband channel state information report.

33. The method of claim 26, further comprising:

sending an indication of the first set of parameters and the second set of parameters to the UE.

34. The method of claim 26, wherein the first type of codebook comprises a type II channel state information codebook.

35. The method of claim 26, wherein at least a portion of the first set of parameters is different from the second set of parameters.

36. An apparatus for wireless communications at a User Equipment (UE), comprising:

a processor for processing the received data, wherein the processor is used for processing the received data,

a memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receiving downlink control information that triggers a channel state information report for a first subset of aperiodic channel state information measurement resources of the one or more aperiodic channel state information measurement resources, the downlink control information being based at least in part on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource trigger offset; and

transmitting a channel state information report to the base station, the channel state information report indicating measurements on the first subset of aperiodic channel state information measurement resources.

37. The apparatus of claim 36, wherein the instructions to send the capability report are executable by the processor to cause the apparatus to:

sending the capability report indicating the aperiodic channel state information measurement resource trigger offset, the aperiodic channel state information measurement resource trigger offset being a threshold duration after which the UE can receive the one or more aperiodic channel state information measurement resources relative to receiving the downlink control information.

38. The apparatus of claim 36, wherein the instructions to send the capability report are executable by the processor to cause the apparatus to:

39. The apparatus of claim 36, wherein the aperiodic channel state information measurement resource triggering offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.

40. The apparatus of claim 36, wherein the instructions to send the capability report are executable by the processor to cause the apparatus to:

41. The apparatus of claim 40, wherein the threshold number of aperiodic channel state information measurement resources indicates a maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE can measure.

42. An apparatus for wireless communication at a User Equipment (UE), comprising:

a memory coupled with the processor; and

generating one of the first channel state information report or the second channel state information report using a set of one or more channel state information processing units based at least in part on the first type of codebook and the second type of codebook, wherein the first channel state information report is processed using each channel state information processing unit of the set of one or more channel state information processing units based at least in part on the first type of codebook, or wherein the second channel state information report is processed using a subset of channel state information processing units of the set of one or more channel state information processing units based at least in part on the second type of codebook, or a combination thereof; and

transmitting the generated channel state information report.

43. The apparatus of claim 42, wherein the instructions are further executable by the processor to cause the apparatus to:

identifying that the first channel state information report has a higher priority than the second channel state information report; and

refraining from updating the second channel state information report based at least in part on generating the first channel state information report using each channel state information processing unit of the set of one or more channel state information processing units, wherein transmitting the generated channel state information report comprises.

44. The apparatus of claim 42, wherein the instructions are further executable by the processor to cause the apparatus to:

identifying that the second channel state information report has a higher priority than the first channel state information report; and

refraining from updating the first channel state information report based at least in part on generating the second channel state information report using the subset of channel state information processing units in the set of one or more channel state information processing units, wherein transmitting the generated channel state information report comprises.

45. An apparatus for wireless communication at a User Equipment (UE), comprising:

a memory coupled with the processor; and

46. The apparatus of claim 45, wherein the instructions to generate the first channel state information report are executable by the processor to cause the apparatus to:

identifying, from the first set of parameters, a first set of channel state information computation times associated with the first channel state information report that is different from a second set of channel state information computation times associated with the second channel state information report, the instructions being further executable by the processor to:

47. The apparatus of claim 46, wherein the instructions to generate the second channel state information report are executable by the processor to cause the apparatus to:

identifying, from the second set of parameters, the second set of channel state information computation times associated with the second channel state information report that is different from the first set of channel state information computation times associated with the first channel state information report, the instructions being further executable by the processor to:

48. The apparatus of claim 45, wherein the instructions to generate the first channel state information report are executable by the processor to cause the apparatus to:

identifying a rank threshold value associated with the first channel state information report based at least in part on the first set of parameters, the instructions being further executable by the processor to:

49. The apparatus of claim 45, wherein the instructions are further executable by the processor to cause the apparatus to:

identifying, based at least in part on the first set of parameters, a first set of one or more aperiodic channel state information measurement resources configured for aperiodic channel state information reporting, the instructions being further executable by the processor to:

50. The apparatus of claim 45, wherein the instructions are further executable by the processor to cause the apparatus to:

51. The apparatus of claim 45, wherein the first channel state information report comprises a wideband channel state information report.

52. An apparatus for wireless communication at a base station, comprising:

a memory coupled with the processor; and

53. The apparatus of claim 52, wherein the received capability report comprises an indication of the UE memory size indicating one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic channel state information measurement resources.

54. The apparatus of claim 52, wherein the threshold number of aperiodic channel state information measurement resources indicates a maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE can measure.

55. An apparatus for wireless communication at a base station, comprising:

a memory coupled with the processor; and

56. The apparatus of claim 55, wherein the instructions are further executable by the processor to cause the apparatus to:

configuring a first set of channel state information computation times associated with the first channel state information report that is different from a second set of channel state information computation times associated with the second channel state information report, the instructions being further executable by the processor to:

57. The apparatus of claim 56, wherein the instructions are further executable by the processor to cause the apparatus to:

configuring the second set of channel state information computation times associated with the second channel state information report to be different from the first set of channel state information computation times associated with the first channel state information report, the instructions being further executable by the processor to:

receiving the second channel state information report that calculates a set of times based at least in part on the second channel state information.

58. The apparatus of claim 55, wherein the instructions are further executable by the processor to cause the apparatus to:

configuring a rank threshold value associated with the first channel state information report based at least in part on the first set of parameters, the instructions being further executable by the processor to:

59. The apparatus of claim 55, wherein the instructions are further executable by the processor to cause the apparatus to:

configuring a first set of one or more aperiodic channel state information measurement resources configured for aperiodic channel state information reporting based at least in part on the first set of parameters, the instructions being further executable by the processor to:

60. The apparatus of claim 55, wherein the instructions are further executable by the processor to cause the apparatus to:

receiving a capability report from the UE; and

61. The apparatus of claim 55, wherein the first channel state information report comprises a wideband channel state information report.

62. An apparatus for wireless communication at a User Equipment (UE), comprising:

means for transmitting a capability report to a base station indicating aperiodic channel state information measurement resource trigger offset supported by the UE;

means for receiving a configuration of one or more aperiodic channel state information measurement resources;

means for receiving downlink control information triggering a channel state information report for a first subset of aperiodic channel state information measurement resources of the one or more aperiodic channel state information measurement resources, the downlink control information being based at least in part on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource trigger offset; and

means for transmitting a channel state information report to the base station, the channel state information report indicating measurements on the first subset of aperiodic channel state information measurement resources.

63. An apparatus for wireless communication at a User Equipment (UE), comprising:

means for receiving downlink control information from a base station, the downlink control information triggering a first channel state information report associated with a first type of codebook and a second channel state information report associated with a second type of codebook different from the first type of codebook;

means for generating one of the first channel state information report or the second channel state information report using a set of one or more channel state information processing units based at least in part on the first type of codebook and the second type of codebook, wherein the first channel state information report is processed using each of the set of one or more channel state information processing units based at least in part on the first type of codebook, or wherein the second channel state information report is processed using a subset of the set of one or more channel state information processing units based at least in part on the second type of codebook, or a combination thereof; and

means for transmitting the generated channel state information report.

64. An apparatus for wireless communication at a User Equipment (UE), comprising:

means for receiving downlink control information triggering a first channel state information report associated with a first type of codebook, or a second channel state information report associated with a second type of codebook different from the first type of codebook, or a combination thereof;

means for generating the first channel state information report using a first set of parameters and the first type of codebook, or generating the second channel state information report using a second set of parameters and the second type of codebook, or a combination thereof, based at least in part on the received downlink control information; and

means for transmitting the first channel state information report or the second channel state information report, or a combination thereof.

65. An apparatus for wireless communication at a base station, comprising:

means for receiving, from a User Equipment (UE), a capability report comprising an indication of channel state information reporting capabilities supported by the UE;

means for identifying a threshold number of aperiodic channel state information measurement resources, a UE memory size associated with buffering the aperiodic channel state information measurement resources, or a combination thereof based at least in part on the received capability report;

means for sending a configuration of one or more aperiodic channel state information measurement resources for channel state information reporting by the UE, the configuration based at least in part on a threshold number of the aperiodic channel state information measurement resources or the UE memory size, or a combination thereof; and

means for sending downlink control information to the UE, the downlink control information triggering the channel state information report for a subset of aperiodic channel state information measurement resources of the one or more aperiodic channel state information measurement resources.

66. An apparatus for wireless communication at a base station, comprising:

means for configuring a first set of parameters for a first channel state information report associated with a first type of codebook and a second set of parameters for a second channel state information report associated with a second type of codebook different from the first type of codebook;

means for transmitting downlink control information to a User Equipment (UE), the downlink control information triggering the first channel state information report or the second channel state information report, or a combination thereof; and

means for receiving, from the UE, the first channel state information report or the second channel state information report, or a combination thereof, based at least in part on the received downlink control information, wherein the first channel state information report is based at least in part on the first set of parameters, the second channel state information report is based at least in part on the second set of parameters, or a combination thereof.

67. The apparatus of claim 66, further comprising:

means for receiving a capability report from the UE; and

means for identifying, from the capability report, a first capability indication for concurrently generating the first channel state information report and the second channel state information report, a second capability indication for separately generating the first channel state information report, a third capability indication for separately generating the second channel state information report, or a combination thereof.

68. A non-transitory computer-readable medium storing code for wireless communication at a User Equipment (UE), the code comprising instructions executable by a processor to:

69. A non-transitory computer-readable medium storing code for wireless communication at a User Equipment (UE), the code comprising instructions executable by a processor to:

transmitting the generated channel state information report.

70. A non-transitory computer-readable medium storing code for wireless communication at a User Equipment (UE), the code comprising instructions executable by a processor to:

71. A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to:

72. A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to:

transmitting downlink control information to a User Equipment (UE), the downlink control information triggering the first channel state information report or the second channel state information report or a combination thereof; and